How far can i go?

[03mustang92]

Car will be paid off soon and i would like to go with a nice whipple setup. If i get a 2.9 will my fuel system be able to handle 18#? or i guess what is the max horsepower i can push without going too far on e85

2 walbro 255's (return)
-8 feed
-6 return
aeromotive fpr
aeromotive fuel rails
80# injectors