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OK, a little more history: I've had the car for 6 years, and it came with the HEI in it when I bought it. I do not believe this is a high compression engine or anything special (although it's not the original 350). I've changed no wiring to the HEI. I've had no issues before this summer.
Unfortunately, I threw away the old coil (it took a couple of weeks for this thing to manifest) before I encountered this problem.
I am running the vac advance through an intake mounted vac switch, and there is vac there. I've also lightly lubed the vac advance (by taking off the cap and carefully lubricating).
How do I check for a full 12 volts at the distributor? I'm measuring 14.2 at the battery. I did get the cheap AutoZone coil, I will admit (hey, I got kids and a mortgage - the fun car doesn't get all the best stuff usually)
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