Buy a pullout from a Crown Vic for $500-$700, turn the boost down and get a better tune. Thrown in a CX Racing intercooler and a slot style MAF and go blow-thru while you are at it. This will eat up most of that $2500 and you should have a slot MAF regardless. Much more accurate and easier to tune.
I'm in the middle of swapping a Vic engine into the car in my sig I bought with a blown motor from someone running too much power on a bad tune and also the guy was a moron.
$2500 will not get you any sort of build that is worthwhile. You can run a stock motor at 425-450 whp safely for a long time with a spot on tune and not being a dumbass.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.