Go for a twin screw supercharger, Whipple opcon sprintex, much better for a street driver. you will have to design a belt drive whichever way you go. the centrifugal compressor has one problem inherant to it, the pressure goes up with the square of the rpm, so no pressure at low rpm, loys at high rpm, great for bonneville running not much use on the street. The twin screw compressors will make pressure at low rpm and the manifold pressure is mostly dependant on throttle opening. I have a Sprintex twin screw (lysholm type), I have boost at any time any rpm, it just makes the engine feel much bigger than it is. mine is a 200ci, it drives like its a 351. The cost is about the same, but perfromaance is much easier to get along with.