I need a flywheel for my 1972 455 and I have two on the shelf but I don't remember what they came off of. I'm guessing the smaller one (12" diameter) is a 350 and the larger one (approx. 13.5") is 455? Anybody have one from a 455 that i can compare measurements. I plan on ordering a dual friction center force clutch. Or should I just buy a new one from TA?