Cosgig is right. The opposite, you need a bushing for the crank to use the early trans. I've seen it done without but the flex plate will crack after awhile along with other things.
Wallered out the front pump on a car I bought with a 72 motor and the original 66 trans. And, it’s the original trans for the car, and coded for a HP application, so I feel the need to rebuild it.
