Thanks for the info. I might go with a 4.15 stroke which would give me a 528. I was planning on calling RBS Superchargers and using their trade in program to see about getting a 14-71. Not sure what my blower is worth, its a Littlefield polished 6-71 set up for alcohol, teflon strips and ready to go. I got it from Hallbrothers Racing for $5,700 which included the mag, offset mag drive, intake, all belts and pullies, crank hub, fuel pump and drive, everything except for the Enderle hat which I already have. I just don't know much about running a blown setup but am about to learn and can't wait! Thanks for the input, Chris