You can use a Felpro gasket with the block off, but will eventually burn through. I use/used a thin piece of aluminum or metal for the block off. Metal to metal on the head with the gasket fully surfaced on the intake side.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
