Sorry, should have provided more info. 440 out of a 76 motor home. Motor didn't run when I bought car due to numerous electrical issues. Motor was rebuilt, .30 over, stock pistons, cast crank, Weiland Intake, 750 Eddy, Firecore RTR ignition system. My buddy who is a mechanic and diehard Mopar guy gave me a cam that he had but wasn't going to use on his stock 67 GTX. It's a Direct Connection P4286677, 272 duration, 48 overlap.He thinks the ignition system is faulty but I have the same set up in my other Charger and swapped distributors and coils and still had the same problem.

I have tried all different combinations of jets and metering rods without any change. As I mentioned I swapped carbs with a friend who have a 440 with no difference.

I just test drove it and tried it running in just second and first gear. Same issue.