The crank part number, per my Chevy book fits 54-62 235s. I think you have a motor much like my OLD hi torque and had been fitted with this drilled crank. The GMC oil pump was the hot set up per the old how to books. Can you tell what pistons you have, should have oversize stamped on the tops? I'd just check this stuff out very carefully for thin cyl walls and cracks before building. It may be just an interesting door stop.
