The math says a 66GPH pump is needed. 800 HP/ 1/2 lb of fuel per hour = 400 lbs of fuel per hour. 400 LBS per hour / 6 lbs per gallon = 66 GPH.
If you ran a 110 pump that would give you a 40% reserve.

http://www.manciniracing.com/homefupu.html


Joe