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My advise is to start with an 8 rib - regardless of what anyone may say. Secondly, focus on selecting a qualified tuner to get your tune dialed in. Just my .02.
Call A&A or ECS, they will be more than happy to answer all your questions...They are both very experienced with superchargers and Corvettes, the best in the country...
I would look into either East Coast Supercharging's or A&A Corvette's Supercharger kits one is a Paxton and the other is a Vortech (forum venders). Do a search on either company, you will find nothing but good this about them and their kits.