One long-time ClubGP guy, radrace19, got a Holley going in some project recently, and I'd also consider Haltech, since they are AUS-based and deal with 3800's there. FuelTech seems like an option, too, but I'm actually planning to start simple with a customized 1998 F-body tune/harness, just to get it going.
I am moving to a new base next year, so when I get settled and the Buick is cruising fine, I'll start piecing it together. A Firebird or S-10 is the preferred chassis, with 04-06 GTO shell (to be a Holden Monaro CV6 clone) or a /ugh/ Mustang shell probably 99-04. Although I hate Mustangs, it'd be great to immediately own their V6 records by the handful with a 3800 swap, and use that chassis like every other LS-swapper.