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Heads would be your best bet bro.
I don't think the FAST IM can do the job. some even say that they don't work.
even with heads 500whp would be hard to achieve with the size of the cam you have. but doable. you would need a very good tune.
If you swap to a bigger cam like for example the LG cam, it would be very achievable.
LG made 530+whp on their Heads/Cam package. I believe it only had the G6X3 and Ported LS3 heads.
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