In addition to the info provided by the Carbking, this may also help.
The following link will take you to the original carter data sheets for Chevrolet cars from 1927 to 1946. I have a paper copy that I got back in the 1970s, but this is the same pages.
Carter carburetor spec sheets for old Chevys
I used this several times a while back and as I recall there is one page that is not marked correctly, so look at what the page titles say when you open them.
In addition to the different style parts used for various year carbs, there are also code numbers identifed on the sheets that are usually found stamped into the bottom flange surface that mounts against the manifold or on the outer edge of the upper body casting surface where the air horn attaches.
Good Luck.
Bob Beers
AACA, VCCA, VTR, TRA, and CPTC