I would think you have everything to get it going. I have an SS, but chose to keep the V8(not the 305). The Harness routing to the inside to the ecm is the same. Motor mounts should be the only thing changed if that. Being it's a G-body the chassis code is EXACTLY the same. As far as the transmission goes a turbo 350 or 200r4 would bolt right up with no struggle. You don't have to run cruise control if you don't want, just another one of those Buick luxuries. Basically just act like the engine bay is a GN bay LOL. Then I think you will be fine. As far as the body harness goes, you shouldn't have to change it, brakelights, headlights, and signals are all controlled by the fuse harness. Relays and such. Just drop the engine in, run the engine harness, fuel pump, of course you would have to change the gauge cluster unless you want to put in an exterior boost gauge(thats what I would do). I was actually thinking about doing the same swap back in '07, but couldn't find an engine anywhere.
