I recently acquired a pickup that had been fully restored and is titled as a 1945 with VIN BD782565. Someone had replaced the original engine with a 235 that has numbers on it indicating that it came out of a 1957 Chevolet pickup.

I assume that the number on the title was off of the original 216 engine.

Is my assumption correct and what year would that number indicate that the original engine could have been produced? I would appreciate any information that you may be able to provide.