If you are pulling your intake you will need to replace your intake manifold gaskets. These gaskets are FEL-PRO considered to be the best on the market. These gaskets as shown are the High Performance Gaskets, gasket set- composite, port size 1.18" x 2.20", thickness .060, comes with block offs for blocking exhaust crossover. Some later year heads 1972 and up need to have the exhaust crossover pockets filled. If you only need the standard intake gaskets and not the High Performance they are also available on the page. Check your application prior to ordering.1965-1976,389,400,421,428,455 cu.in.