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Just order one of these, My dad turned me onto these when he had sealing issues on his built 360. The have 50 percent crush, and are the sh$t!! I ran one for 6 months with no problems, until I seized my motor!! Dad put a set on his truck 3 years ago, and hasn't had a problem since.
Remflex exhaust gaskets (header - manifold - gasket) - OnLine Catalog