http://www.superchargerusa.com/olds_bk_street.htm
If you want a centrifugal charger then you'll have to make your own mounting brackets, etc. It's been done by quite a few and in fact, I know of one person that has ran two centrifugal superchargers on his Olds.
Another has adapted an Eaton M90 supercharger similar to the factory style superchargers on the Grand Prix GTP's, Ford Cobra Mustang, etc.