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You're not going to get 500fwhp without doing a cam, unless you go forced induction which is a great way to go, but not economical. Staying NA, you should get 500fwhp with:
Air intake
Long tube headers- I'm not sure if the LS3 likes 1 3/4 inch or 1 7/8 inch better for NA power.
Mid-pipes with high-flow cats
Cat-back exhaust
Moderately aggressive cam with appropriate valve springs
Dyno tune
Heads can stay stock
Your best bet is to go onto a Corvette forum and ask the LS3 vette guys what they're doing.
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