This 1962-1963-1964 Chevrolet 409 4bbl rear Carter AFB Carburetor #3362s has been completely re-manufactured. This is part of a dual quad setup for a 409/427 manual engine. Note that the rear carb is different from the front (#3361s) in that it has a choke and idle screws. The carburetor also comes with new gaskets. We don't rebuild our carburetors, we re-manufacture them so you can rest assured these carbs will last a long time.