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I don't know what the ports on your 350 look like, but I'm using an Earl's pressure master gasket on my 383 (cylinder head exhaust port is traditional 23 degree square port Air flow Research / Brownfield Racing). The pressure master gasket is an aluminum frame with a graphite impregnated steel insert. I have never had a leak with these gaskets. And up until I changed starters, my full length headers touched the starter housing. So I never knew if that caused an excessive gap.