Your bonnie should have the 3.8 liter engine. Great motor with or without the supercharger. Now, the 3.8 did have a factory supercharger as an option. Can't remember if it was available for the bonneville. But, it was on the Grand Prix. Also on the Buick Regal and Park Avenue. Check around in the local junk yards... you should be able to find a few. But, you're looking at pulling the intake, wiring harness, injectors, pulleys, etc,etc. And all for 35 extra hp!!!
if you're just wanting an extra kick in the butt when you hit the gas.... Go with a "dry" nitrous system. Easy as hell to hook up. "W.O.T. switch goes under your gas pedal. (WOT= wide open throttle) tank, plumbing, drill a hole into your intake tube before your mass air sensor, and a nozzle that holds your jet. 2-3 hrs and your pushing up to 100hp extra
