What trans do you have? A 904? I would think the flywheel should bolt up, but some crate motors come with the flywheel. If this one does, I'd use that one and get a torque converter to match. Is this the 380HP engine? If so, you might want to think about a SB 727 trans, as I don't think your 904 will live behind it for very long. You could also look into a used, low mileage, late model trans out of a Ram or Dakota. Good luck!