Well, since Cads never were hooked to a stick, there won't be a pilot bearing hole in the crankshaft. A machinist will be able to bore one if you take him the shaft. I believe the Cad shares the B-O-P bellhousing pattern, but not 100% sure. If so, any Muncie will work, but that's a heck of a lot of torque for any automotive tranny to absorb. A Nash or somethjing similar might be the way to go.