Blown 302 H/C/I questions tune/program, etc..

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All Im saying is, that person above said its not possible to make 500 with GT40 heads

The "person above" didn't say it was not possible to make 500rwhp with gt40 heads.
He used the sum of the parts you suggested you were using to let you know that you weren't going to get 500rwhp with an S trim and gt40 irons.
Nothing was said about a turbo.

Good luck spinning an S trim that fast with a set of restrictive iron heads, should make for an incredibly unreliable ride.