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Engine grounded/ control box grounded ? First step would be check and be sure wires are in correct order, second check coil output. The dist here is very suspect I would pull it and replace it with known good dist. If that does not work get a advance timing light and see what timing you have when it pop's I try getting mine to 38-40 degree's total If it talks turn it back if not give it more you could have damper that is going off by ring slip{ not Likely but possible if original}Also a vacuum leak will do the same Thing valve springs can do it also{ not likely}



Engine has a good ground. Haven't checked the control box ground though. I will!

How do I check coil output?

Since I don't have a spare distributor, should I go buy a parts store replacement and try it? They probably have one in stock.

I've double checked the dampner mark with my TDC tool. It's only off 1*.

Haven't been able to find a vacuum leak.

I will pull the valve covers this weekend and give the valve train a looksee.

Thanks so much for the input guys. Keep it coming!!! Sounds like a have quite the laundry list to go over this weekend. I really appreciate it guys!