Thanks Tom. Not trying to be too picky but. Which stock size? Are we talking any old Pontiac 389/400? Or stock 421 SD, whatever that was? Or stock Ram Air IV? Or stock SD-455? Each was different. A Felpro Gasket number would be a tremendous help. Thanks again, Just trying to stay ahead of the game. Going to make my heads fit a gasket, then when the intake comes, make it fit the gasket as well.
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