Will be pulling the distributors on my 1976 308 to inspect them and to replace the small O-rings on the ends of the shafts. The car is dripping oil and I've traced it to the distributors. I did this years ago to stop the same leaking problem with small O-rings I bought at Ace Hardware - I'm surprised they've lasted so long. I may also replace the points and capacitors and do whatever else needs to be done while I have the distributors out. But my problem is setting the timing after I reinstall the distributors. Tried to time the car a few weeks ago, but could not see the flywheel markings with the timing light. I went ahead and set the timing by ear but I'm not sure that's good enough. Where are the markings, my shop manual is not specific. Are they on the flywheel gear teeth? If so, how do I clean the flywheel so I can see the markings without removing the bell housing -which looks like a formidable job?