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I have a 390fe which had a very dissapointing dyno run. After learning my side pipes and intake manifold were of the restrictive type thats all I changed. First the intake and the car ran very bad with my sidepipes. Then after changing the sidepipes to rare irons 2.5 dia mufflers the car picked up 70 hp on the dyno. My cam is about the same as yours. I also use stock iron heads D2TEA. I'm a believer in what has been said. It's important to get the A/F mixture correct too.
John
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