383 to 727 help - 66 Charger

A flywheel is used on an 833 manual, a flexplate is used on the 727 automatic. I would say that if you can't get the asymmetrical bolts to line up that you need a new flexplate. Mind you, the 318 has an internally balanced converter and a 383 does not. You may need to change the converter as well, or maybe just the converter.