I have an engine, cast # 577476-4 1/8, # on head "looks like" C 15154, 371? cu. in., year?, that's not much good. It came out of a car with a standard tranny having a pilot bearing drilled out. I would like to replace it with a 63 Starfire 394 that had an automatic. Can I just swap the cranks with no problems? Or do I have to drill out the 1963 crank. Thanks.