I did this years ago on my '76 308, but now can't remember how I did it. I want to remove the distributors, replace the O-rings, and reinstall them. But don't I have to make sure I reinstall the distributors exactly in the position I removed them? Is there another way of doing this other than taping the rotor to the distributor body with gobs of masking tape, so it doesn't rotate while I'm working on it? Like is there a special setting for the distributor when the engine is at TDC? Are the rotor shafts keyed to the cams so it doesnt matter if I turn the rotors? Can't find anything in the user or workshop manual describing how to remove and reinstall the distributors.