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Please read my thread called "Dyno numbers and Cam Selection" posted on the FE forum here by me (Shelbytexas). I have a very similar set-up with the PI intake and the Edelb. alum. heads. The HP out of the 454 is only 300; I have consulted MANY and am convinced I needed: 1)worked heads 2)more cam 3)Roller cam and lifters.
Evidently these heads flow about like stock heads and you can make terrific gains with this work.
Good luck!
Ken
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