I have a 1950 GMC with a '74 250. The truck came this way. It is bolted up directly to the old 3 spd and torque tube rear end, but has side engine mounts added. I do not think the bell housing is original since it does not have mounts for the crossbrace. I think for an auto, you'd want to add the side engine mounts and a new rear tranny mount. You also have to swap out the torque tube rear end.