If you have the original registration or title, often gave the engine number and possibly was used as the vin number. Post these numbers if you have them and we can possibly tell you what engine was orignal.

My 46 235 BIG TRUCK motor had "235" stamped on the pan as so have other High Torques I've seen.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed