I agree 110% a 13mm is a lot of fuel. A good bench tuned 12mm should be good with the proper air, injectors and tuning.

a 150gph lift pump will support those #s

750hp is a lot in a 12V daily driver. If you an find a buddy with a truck thats been dyno proven to be in the 400-550 range take a ride in it and you may find out that somthing with 450hp is a good fit.

 

whats a 13mm pump what size is a stock pump.

 

13 mm is the size of the plungers and barrels ... stock is 12mm