Exhaust Manifold Gasket Replacement: Big Block Dentside Ford

This time at the Quick Speed Shop I'm working on my 1977 Ford F250 Camper Special big block 460 powered Ford truck. Its had a blown exhaust manifold gasket on the passenger side for several years and now I'm going to actually fix it. I once I replace the gasket it still leaks? Now what? I have a trick that includes doubling gaskets and adding high temp RTV. Will that work?
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#manifold #gasket #engine