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Use about a 1/4 inch bead of RTV silicon or, as recommended, the Right Stuff for the end gaskets. The cork tends to want to drift around when you're installing the manifold and when you're tightening the bolts. As I recall Edlebrock recommends the RTV over cork or other material.
If you don't feel you need every erg of performance out of the engine open up the heat passage. It makes for a more civilized cold motor.
DonC
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