This is a very rare find. An Oldsmobile 1961-1964 NOS GM Delco Rochester Carburetor for a 2 BBL 394 Cubic Inch Displacement engine for a full sized car. It has never been on a car.You will NOT Find another one of these. Ever ! I would recommend simply tightening up the body screws,bolt it on,and I think it should work just fine.Some might recommend a rebuild kit for a freshen up,but it may work just fine like this.This is 22-535 Delco or 7016106 by The Oldsmobile parts Catalog.