I have a 70 440 hp engine the crank pulley is a 2 shive unit but the outer shive is bigger than the inner. My experience is with 68 stuff and both shives are the same size. What’s correct 1970 coronet r/t 440 4 speed car was a 4v but now has a six pack not that it should matter. I’ve got both pulleys just want to put on the right one thanks