Heres another option. Im considering either rebuilding my Rochester B carburetor, or replacing it with a new carburetor. I was looking up rebuild kits, and came upon the "Daytona universal carburetor" They make a few different replacement carbs, but theres one that is supposed to be very similar to the "Zenith" carburetors. They are for six cylinder engines from 192 to 261 cubic inches. You can find it at Mikes Carburetor Parts on the web, go to Rochester carburetors 1 barrel carbs, and its there. Im going to start another forum to see if any stovebolters know anything about them.