You will need headers for sure, also Ported Heads, Cam Intake Throttle body.
I can help set you up but it is an expensive way to 125 more HP and will never make the torque the blower makes.
Look at my 560 RWHP Street Brawler Package makes 645 crank HP on pump gas.

Hows 450 RWTQ at 2200 RPM.

Ted, thanks for all the info you give on this site. I think I have read it all, thats alot of time. But I have a question I hope you can help me with. I'm looking to get more HP but keep it natural asperated. Thinking about CAI, Headers, cam upgrade, and Tune, already have Corsa ext. I'm I on the right track? looking for about 100 to 125 more HP. I'm in Arizona Can you recommend any one out this way to do it. Thanks Mike