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Do you want a road race machine, drag race machine, or a street machine? The answer to that question will determine what "should" be next.
Don't waste $ on the FAST. We've done a lot of individual testing on those with the LS3/7 engines and I can tell you from first hand experience they're not worth much (if anything).
If a blower is in your thoughts look into the A&A kits. They're a very clean install and our blower of choice to use.