FiTech EFI system

Sorry for being lazy, BUT I'm not reading 50+ pages.

For any BB/440 guys running FITech's stuff, any issues achieving HP? From what I read on their bigger 8-injector offerings, they rate them between 600-1200 HP but only have a 800 CFM rating, which makes it hard to believe they could get anywhere near 600HP. I know when I plug a 447CI@7kRPMs into a CFM calculator they say ~950 CFM needed for Strip/Drag racing.

Personally I'm shooting for 500+ HP but I don't want to be limited on the top end, especially since I'm building an engine capable of hitting 7k RPMs. (Capable, not planning to hit it that hard too often.)