The LS7 was simply made for a 427 displacement. You can make most anything anysize you want, but you will be sacrificing something in the long run. It's just a matter of how much you are willing to let sacrifice on the cost to performace scale.
Heck you could make your LS1 a 427, but you are so far stroked and bored that any little slip will cost you a block if you haven't darton sleeved it, which is half the cost of a short block of any of your other options listed above.
For cost wise, why not just use an LS3 and just work on the other potentials of the engine, port match everything, put your leftover money into suspension and weight reduction, then get a great tune. You will come within your HP range and not be sacrificing your reliablility, which is what was stated as a concern at the beginning of the thread.
Don't forget an LSX which can be anything you want as well, just about 100 lbs heavier, but you'll never break it.
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1999 SS Hugger Orange M6
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