Well, I have had plenty of problems with my point distributors.
With age my '69 340 dual point began to move away from the official dwell angle specification, and I had to resort to guestimate tuning. Later I replaced the timing chain, but that didn't fix it. Bought a new distributor, but that didn't fix it either.
Anybody know how to fix this?
If you don't see two dolphins, you need a vacation.