How do you get to the aft spark plugs of my 328?

I didn't find it particularly difficult when I did it a few days ago for the first time. It just requires the right combination of socket extensions to get the length right. I was able to do it by either reaching under or over/behind the hood, depending on the particular cylinder. It would, of course be much easier with the hood removed but I don't see any reason at all to remove it just to change spark plugs. If the hood was off for some other reason it would be a perfect time to change the plugs but it didn't take me more than maybe 30-45 minutes to change all 8 with the hood in place.

 

Take a 3 or 4 inch extension combined with the appropriate spark plug socket and slip it into spark plug hole without the ratchet attached. Do this from the side of the car slipping your hand between the hood and backwall. Once the socket and extension are slipped into place, fix the ratchet onto the extension and wrench away. Easier to do with a cold engine.

 

With the hood up, reach over the hood and behind the glass under the spoiler. Not real easy but doable. If the hood struts are weak you will be risking getting hurt. Put a mechanical strut to hold the hood up, like a broomstick.

And you mean the front plugs. The aft plugs are the easy ones.