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The cam can definitely be swapped with the engine in the car, not sure how much work it will be. As for HP levels on stock internals, if you stay N/A, I think you will be pretty safe with full bolt ons, cam, intake, headers, exhaust, tune which should get you around 500 (flywheel)hp, maybe more. With some nice heads I am sure you could see 525 without too much trouble. Personally I would'nt want to extend the rpm range much without moving to forged components, it all just depends what you want to do with the car. Look at the GM performance engines they sell, such as the 515 hp version of the LS3, which has a better (carbureted) manifold, and the hot cam, so if that has the standard cast crank, etc. you know they have tested that combo to live.
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