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no i havent figured that out yet but talked to a guy at a local speedshop and he said he had the same heads but with the 1.94 or w/e size valves that are a little bit smaller and he had an edelbrock rpm cam in and he said it ran and sounded good
but im going to have to call COMP to see what they say...(if im goin to go with the turbo setup)
i would do the 306. a 331 with a turbo is going to push the limits of the stock block especially with the 70mm turbo that comes standard with the BG kits