New Fel-Pro carburetor insulator.  This sits between the carburetor and intake manifold and is a heat shield/insulator.  This is not used on every application, only models where heat soak was a problem.   Gasket not included. Fits the following:

70-87 Firebird/Trans Am w/ 305 Chevrolet engine with Quadrajet 4bbl
70-87 Camaro w/ 305 Chevrolet engine with Quadrajet 4bbl