8k to spend on FRC
You should be able to do an exhaust swap(LG Pro Long tubes) on you own with good tools. Add a cold air intake, and an underdrive pully plus and EWP by Meziere, jump up to a 90/90 combo for you TB and Intake (won't see full effects until you get your heads and cam though) and you should see around 65-70 rwhp increase, maybe more with a good quality tune. That's all I can add at this point. That's about 4500 so far doing it yourself and having the pros do a tune. Another 3500 should get you your Heads, Cam, and all necessary valvetrain upgrades. Good luck. I put down 473 rwhp and 431 rwhp and I only used a FAST 78 mm with a ported 78 mm TB.
What about this head/cam package? http://www.lmperformance.com/5911/4.html
I dont want to do gears. I had a 02 GT mustang with 4.10's.. It was kind of cool, but no traction. I like the gears on my car im pretty sure they are 3.42's goes about 100 in third 140 in 4th.




