This is where a engine dyno is a invaluable tool and I’ll bet I done this a dozen times for customers. If you are taking the engine out, take it, your ignition system, air cleaner and exhaust headers to an engine dyno. In a short period of time they will either have the tune up figured out or tell you the problem is back at the car. I.E fuel delivery, exhaust sytem. Or you could keep changing things until you fine it. Fuel, ignition, voltage, cam etc etc.


Joe

edit: I was typing up my reply before i seen your last post.