I rebuilt this 1963 394 Starfire Rochester 4GC for a replacement but I sold the car. I used Mike's Carbs parts to rebuild it and it should work fine . Has the original tag on it part number 702405, for 63-64 394 Oldsmobiles. This carb has the hot air compensator for A/C equipped cars. Will work fine on non-A/C cars as well. I have another very good rebuild-able 4GC that goes with it if you want it. $225.00 or best offer plus the ride out of Dallas