I’ve been lurking here listening to all the advice. I’m not a professional tuner but I know enough to keep me out of trouble. With the exception of the heads your engine is about equal to the 451 I had in my Charger. Not really a Holley guy but know enough to be dangerous.

From the latest postings it’s sounding more and more to be ignition. Having not seen your car in over a year it would be hard for me to comment. Let’s say we get together and solve this problem. Just set aside a day to give us time. Between the two of us we should be able to solve the problem. Send me a PM or text me. I know you have a busy work schedule but being retired I’m flexible.