i truied another plug to no avial. and the ignition is already exlextronic converted. im thinkin maybe the coil is jacked cut it was converted years ago. Maybe a new coil . Would a coil fit from a newer engine that didnt have points
Did you put in an offset flywheel key? And if you did, did you put it in backword and retard the timing instead of advancing it?This could cause exhaust backfire.