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  1. 1964-1974 Tempest/LeMans/GTO Engine Tuning
    Hello all, I am just trying to confirm my understanding and choice. I am building a 461 from a 1965 389 and a mild cam. I am guessing 420-435hp. Running With a Magnum tremec. It will be ready in May. The heads are stock cast iron ported by Butler to 230cfm. I am running E85, so no aluminum...
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