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I have a 402 built very much the same way. I might have a bit more work done on the heads but I have the KB pistons and a similar cam set up. My builder who is a race guy tells me that I need at least a 750 cfm carb. I had a Holley 750 custom built for it. Are you sure the 650 cfm carb won't restrict that all important airflow you need to unleash all that power? Just another viewpoint for you to consider.
Larry
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