Did I miss the boat, or did you not say if there were points or elec. ignition? Has the distributor been out of the motor? Id so, it may be installed improperly. Find top dead center and reinstall the distributor. Double check the points and/or the module. When I was your age I installed a distributor 180° out of sync. Wouldn't run, but man, what a backfire!! You may be a few teeth off, is that possible w/ Mopars? I know it is w/ my Vette.