There are many Carter YF versions for various engines and years.
The model number on mine is stamped on the flange that connect to the cast iron base.
It's the number followed by and 'S'.
Here are the Chevy YF models from 1932-62:
756S, SA, 787S, SA, SB, 788S, SA, 789S, SA, 964S, 965S, 966S, 967S, 2008S, 2046S, 2100S, 2101S, 3211S
Looks like you got one Model 938SA, but it doesn't list as a Chevy model.
