I would do something similar to NJNETSFAN, built auto and a 9" rear. or you could always just use a t56 if you want. It should be able to handle a boosted motor. A mildly cammed turbo will let you keep semi good MPGs, while also providing a ton of power and upgrade potential down the road
3-5k -
Used/ebay Iron 6.0...these motors are getting cheap
full rebuild
forged pistons/good rods
L92 heads - factory 300+ CFMs
custom, but not crazy, boost cam to keep the fuel cost down and driveability up
2-3k
intake manifold
throttle body
fuel system upgrade
intercooler and piping(if needed)
5k
trans/rear
3-the restk
Custom made turbo manifolds/turbos or a giant supercharger....user choice

tuning
stuff you realize you need later on down the road
Edit: Why is everyone talking about motors at 6:00 am?