I believe iron heads and manifolds are 40 ft/lbs but you have aluminum heads. I would go to the Edlebrock website and see what they say. I know they have torque settings for their aluminum intakes. I wouldn't go 40, if anything start light then snug them up a few times after a heat up cool down cycle.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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