I dont have any experience with 4 spd in buicks however i have done many conversions on small block cars. You'll need pontiac bell housing 3rd pedal assy out of late 70's early 80's malibu.(maybe other cars i dont know) tranny and shifter of course. I dont think it would be that hard. You will also need a BOV so when you push clutch you dont damage impeller on turbo.