That is a good question, Dennis
No gasket is mentioned in a Shop Manual.
Most people use a gasket between the carburetor and the insulator, and many people put a gasket between the insulator and the manifold.
Be sure the cut-out in the gasket between the carburetor and insulator aligns with the hole(s) in the base of the carburetor.
Last edited by tclederman; 03/26/2016 4:43 PM. Reason: kept the topic on carburetors - thanks, Bobb