IMO KBs are better suited for mod motors. I think you'd be happiest with a centri blower.....you can't go wrong w/ procharger (although they're known for tossing belts), vortech or paxton. It depends on your plans for the car - street or strip, and how much you're looking to spend.
+1 KB/Whipple for Mod motors....Centri for the 5.0. Procharger would be my choice...