racecar fuel delivery

I've had diferent style regulators, in a couple different places, on a racer, and a Holley reg seemed to work best up on the valve cover, close to the carb. I liked the Mallory return style reg also, but it required much more plumbing and I don't think I'd recommend it.
Sounds like you're trying to feed a monster? #10 is gonna require a pretty health pump to push the fuel to the front and keep it there.