Can I drop a 350 chevy eng and transmission into my buick since it came stock 350 Buick? I think since its GM I shouldn't have a problem but Im pretty sure I will since the motor mounts might have to be changed, and the rear end shaft of my 1968 Buick might not link into the tranny. But I have an Idea, Can I use half the shaft of the 350 chevy eng and tranny and the other half of my Buick and weld it together at the exact measurements?