Holley C9AF-9510-U FoMoCo high performance 428 Cobra Jet Carburetor 735 cfm Ford Mustang. Taken off of a running driving '40 Ford hot rod with a 350 SBC. Car was built 15 years ago, fully restored, then parked after being driven just 20 miles. I removed it to install a smaller CFM carb and because there was a slight gas leak from the rear float bowl. Car ran great with this carb on it. I can't promise, but I'd guess it simply needs a new gasket kit, NOT a full rebuild.