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My Shelby 482 has a hydraulic roller cam with a 112 LSA, 244/252 duration and .618/.638 lift. It made about 581 with a rich mixture and, when leaned out, made 601. So you're HP is fine. As mentioned above, change the cam, intake manifold and/or carb and you can get another 25-75 +/- HP, if so desired.
I kinda kick myself now for not going a notch larger with the cam. Eh, I'll live with it.
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