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I would barely touch them if anything at all. You do want velocity with the Webers, but you don't want to do anything to disturb that either.
Which heads do you have? I just made 475 hp with a 331 and Trick Flow heads, with a 1262 (not R) gasket, and a Victor Jr. intake that I pulled out of the box, cleaned up, and bolted on. The intake ports were smaller by a significant amount, so you can see the horsepower potential with a small runner.
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