John. I don’t think your question can be answered without pulling the carb. Going from a very fuzzy memory, I do think the vac passage in MY Carter is clocked in a slightly different position than the Rochester.
There are a few different versions of the base gasket. The one often supplied is multi-slot affair with a few different options. I do think that one will work on either carb, but if you don’t recall what your gasket looks like…you better just “embrace the suck” and unbolt your carb.
