Hope this is in time to help you. First thing, is don't listen to anybody on here about building your engine because without a doubt, they don't know what they're talking about. I've done it. https://www.youtube.com/watch?v=LOlP7NNdiQ8 https://www.youtube.com/watch?v=jfpM9IUoI4k
And I was the first private individual to get more than 500 horsepower rwhp out of this engine. I have read several posts on here and every single one of them is wrong in whole or in part.
1) You don't need a throttle body just get a boss or a Cobra Jet manifold with a CAI
2) upgrade your valve springs 4 high RPM application because that's how you're going to get horsepower out of your engine. On a 2011 GT there's a hard stop at 7750 RPM. You will have a hard time going beyond that.
3) As usual csamh is often wrong but seldom in doubt. he said that Kook headers won't give you much. They gave me 30 hp by themselves Dynotested. God, I wish he would stop posting so much, because virtually everything that I read of his is absolutely wrong. And In general anybody who has thousands of posts in hundreds of forums is spendin more time doing that then working on his car,
4) Port your heads. There are varieties of companies and engine builders that will do this for you I actually sent my head's to Livernois and they gave me a stage 1 porting.
5) Raising the compression ratio on your Pistons isn't necessary however forging your bottom end is always a good idea and that's what I did to mine. I am in California and have to run 91 octane gas with a lot of additives in it. So going up and compression was not an option. But I got 522 rear wheel horsepower on 91 octane pump gas without having to increase the compression ratio.
6) I use comp stage 2 cams. Now one of the posters went off on how crummy Comp Cams are. I currently have 22000 miles on my engine. Tracked several times it's been on the dyno several times and it's completed in high-speed events . . . no problems. I can pull up a thread dissing any product Or demonstrating a product failure. So what? The general consensus is Comp Cams are just fine. Again, beware of posters with a thousand + posts I am not saying their always wrong, but think about it, what kind of person publishes thousands of posts? No life. And desperate to be recognized. They will scour the internet looking for proof to validate their bias and then they feed it to you link by link.
7) You will have driveability problems with stage three cams. Stage two cams will give you some low speed driveability problems on a cold engine as well. Stick to Stage two.
So do the above and reach your goals and as for the rest of you who have not done this or have no personal experience with any of these parts you opine about, become a politician and join a professional group that makes a living at not knowing what the hell they're talking about.