According to this chart
http://www.chicagocarburetor.com/pdf/Instructions-Rochester-B-BC-BV.pdf

All the Chev B’s, BC’s and BV’s used the same float settings. Mine appears to be 1/4” too high. It’s a place to start.

Jon,
The carb was recently rebuilt so it has all new internals. The floats are empty and dry


Pat
1940’s tech was great in the 40’s