head gasket? lots of smoke

Can't I get a break? over the winter i replaced 355 motor and resealed engine. Car is running good thank God. Then I had the dreaded circlip failure on my lotus esprit so im in the midst of fixing that and and rebuilding that motor. Hopefully couple more weeks. SO i decide today to take a drive in my 89 tr. A bit of a long drive (200 miles). Car is running well felt a bit sluggish at times but nothing major. About 150 miles in smoke starts billowing out of the 7/12 bank exhaust. When pressing gas its blue when just coasting or idling its pure white. Temperature and oil pressure normal. So i get home and pull plugs on that side. 10-12 plugs normal. 7-9 plugs wet with oil. when i started car and had those 3 plugs disconnected no more smoke. Plug 8 and 9 were worse. now im guessing could it be a head gasket(not so bad) or worse(pistons or valves)? Unfortunately I have to finish Lotus before I can yank TR motor.
About 5 years ago i had norwood in texas fit car with EFI system. Has anyone heard about these cars blowing head gaskets? here are the photos of plugs in order 9,8,7. When I shut car off I could hear like water being pressurized in back of motor in the head by the 7-9 plugs. Just cant seem to get a break these last couple years. Car has almost 44000 miles and I own this car since 1997. I never beat on it and in 2001 blew the diff carrier and had ferrari replace it back then. Hopefully they had put the better carrier in there. Any help would be appreciated.
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The car is an 89 with an upgraded motec fuel injection setup. im going to do a compression test over the weekend

 

Also sparkplugs were replaced 3 years ago

 

Not long at all. Drove her over the winter a few times cause we had a warmish winter here in CT. Also drove her for like 60 miles just a few days ago.


Ignition is stock but has MSD coils and ignition box.

 

Just went and bought a compression tester. Going to test the cylinders. No water in oil. I also have to get a leakdown tester so I can check that as well. Have to order one and a coolant pressure tester. Car ran good except a very slight stumble at like 2500 rpm. But it had been doing that for a while. it just started smoking like crazy. I dont know how to post a video otherwise Id post it. No rattles knocks or anything.

 

All cylinders and coils are firing. I just did a compression check on all cylinders. Across the board they are at 160 with 3 at 165 and 2 at 170. That with a warmed up engine and throttle wide open. I also did a compression check with the car running at idle all compression readings were 110-115 when you gave it a little gas and reved it say to 3000rpm they all were 150psi. Now the interesting thing spark plug #7 pisses out oil with plug removed when turning engine over. This is why I believe plugs 7-9 are wet with oil. That bank of cylinders share 1 header and one exhaust pipe. I have a borla system with 4 cans. I believe the reversion waves are carrying oil back from header and wetting the other 2 plugs soaking them with oiil since they share the same header. If i Disconnect lead to cylinder 7 car stops smoking. Hopefully its a valve guide or head gasket and not piston ring. Im not going to drive car until I can pull engine out and take it apart. Unfortunately thats gonna be in a couple months because I have another car on the lift and I am redoing that at the moment.
2 questions-what is the average compression reading on this motor?
And two has anyone ever changed just one piston(worst case scenario) or do the whole setup and bump up compression a bit and since I have Motec engine management set up in car I can mess around with it

 

You see I dont know when to check car for compression. I just did a search and saw contradicting posts. Some say a hot engine will give false results (On the low side). Others say do the test with warm engine. But all the readings are within 10% of each other which is good. And I found which cylinder is causing the smoke.

 

Like I said I tried every way to do a compression test that I could except with a cold engine. I was told to do the running motor test because it will tell you if its in the heads or pistons. They say you get a certain compression result with engine idling and when you snap the rev and see how much the number increases it will tell you where the issue is. I dont know I just tried it. The numbers were still all the same. The funny thing is the cylinder with the oil coming out gave the best reading 170psi. But that could be because the oil is helping seal the rings better, I dont know. Really hoping its just a valve guide or something. Motor wasnt detonating or anything. Car ran smooth like a said a very slight hiccup at 2500 rpm in 5th gear but that was all. It has been doing that for a while. I just coughed that up to the programming in which Norwood put in the motec unit. Different climate in texas than Connecticut.

 

And this just happened when I took it or a long ride 250miles. Have put like 4000 miles since I got it back from Norwood like 3-4 years ago. I drove it like 70 miles or so just a couple days ago as well with no issue

 

Funny thing is when it first happened and while on throttle I wold get some blue smoke but when coasting or off throttle it was a dense white smoke. Smoked more when coasting then when stepping on gas. If I lightly toched the throttle minimal smoke. More gas a little more smoke (blue). Let off throttle a huge smoke cloud (white). Looked like the game Spyhunter with the smoke screen option