XR6T is one of the best value falcowhores you can get. Was looking at buying one of these babies years ago when they came out.
The engine and transmission in the XR6T were light years ahead of the crappy pushrod lumps of irons in the local V8s when it came out. It is very easy to make big power out of the engine with just bolt-ons. Air Power Systems have very comprehensive, banf-for-your buck kits eg., 390kw and 10 sec car with bolt-ons
http://www.airpowersystems.com/falcon/xr6turbo.htm
I believe some of their milder stage I systems are street legal...
Whack on a whiteline suspension kit, AP brakes and you're good to go.