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I know of stock displacement ls1's that make 500rwhp with no power adder. They are using aftermarket casting heads but still I dont think those heads flow more than a ported ls3. I think the key is matching the correct part combo. What you really have to get right is they cam and tune for your combination. They cnc porting job on the heads is very important also. Have the intake and heads ported together and have someone who really knows what they are doing spec you out a cam. I dont see why with the displacement and head flow of the ls3 why these motors cant make 525+rwhp.
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