W/r/t "Add 7 lbs of boost and you're over 600 hp. Slide that up to 10 lbs of boost and you're crowding 800."

That sounds nice, and is repeated all over the net (even by people who sell blowers).
Their math basis:
New HP = Old HP × (ATM + boost) ÷ ATM (14.7 at sea level)
Example 1: 450 × (7 + 14.7) ÷ 14.7 = 664
Example 2: 450 × (10 + 14.7) ÷ 14.7 = 756

This is not what happens, the increase is much smaller and decays with higher boost.
More of my thoughts on my site here: http://victorylibrary.com/mopar/blower/blower.htm