what is sp?? I just put that because i am not sure the exact spelling and dont feel like looking it up.... But centrifugel looks like the turbo type.... Dont get as much hp gains as the roots type. But my father (if 400hp is reading) is building a 392 hemi with a bds blower and bds has their shit together. They have programs where you can hook it to the internet and they can tune it via the internet.... They do have their shit together. But the downside they are expensive. You can always get a weiland (sp again) they are good superchargers

hope this info helps

also what kinda boost are you expecting to run? what psi?