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I don't think there is a big advantage to building a 427 if your going to boost it, I'd build a 377 up to maybe a 408. I agree with Choda, GM has done a great job with these heads and will not require a lot of porting, but more of a clean up with new valves and springs. Some light porting will really make them flow much better but you can hurt power by over porting them also. Are you still going to run a Pro Charger?
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