And to answer some of your question:
I have a Stage I SC from GTM making 100% claimed power GTM stated. I am sitting at 400whp and I started at 270whp bone stock. Not sure where you are reading or getting your information, but both Stillen & GTM have provided exactly whay they claimed with their SC kits.
For 7k, 130whp is a pretty good bargain compared to other parts you can buy. You would spend easily 20k doing your NA build and honestly you will not see 500whp, 500 crank might be possible but then you are down to 450whp or less which makes for a horrible investment compared to what other options there are.
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