It looks like a Zenith, it’s on a 1955 Chevy 235. The car is a 150 sedan. I thought Rochester’s were the carbs on all 235 engines.
The Rochester "B" series was used exclusively by Chevrolet on their sixes in the 1950's and most of the 1960's. Lots of folks felt the AFTERMARKET Carter YF built specifically to replace the Rochester B was superior when new. Lots of folks today feel the Carter is greatly superior to the Rochester B. Unless your desires for your vehicle is either museum or national restored shows, be very happy you have what you have. Jon