I know you want to stay away from the electronics, but the good even-fire engines are electronically controled. So, as you'll have the computer to deal with anyway, I would suggest getting a FWD version of the 3.8L with supercharger (gives a little bling if polished) good for 240 HP stock (260 HP if you score a '03 or newer). Salvage yards will sell you the engine and computer system complete for around $1000.

Ideally, I'd also look for a RWD block (I believe there are differences between FWD & RWD) and just swap over the internals from one to the other. The 3.8L will take just about any trans GM has used, automatic or manual. Many who race FWD Grand Prix's using this engine easily get 400 HP from these engines, and with the supercharger having bypass valve, it'll only use minimal HP while cruising which should get you well over 25 MPG while on the highway.

The engine RPO code is L67 (prior to 2003) or the L36 (2003 and newer). Check out L67 Swap.com . This is a forum dedicated to swapping this engine in other GM cars, but the info is good for putting this engine in just about anything. Good luck.