14.6-14.8 if the tune is on, which im sure it is with wheatley doing it!
That is assuming you have the fueling to do it. That means injectors too, the stock injectors cant keep up with a cammed 5.3

 

I think 14.4-14.5. If on slicks, high 13's worst be in the low 14's

 

sounds like its a ground, or ground wiring. run new wires from the relay back to the pump, and bypass the factory wires, and use a thicker gauge wire like 14-16g. that way the wiring is a known good, and then if it doesnt work go from there. I think if you search you will find write ups on fuel pump wiring with larger gauge wire ect. oh and 14's good luck

 

alright thanks fast for the advice im gonna look up all that wiring bullcrap right now and all i want is to beat my buddys mustang its stock and hes talkin all kinds of **** so hopein to beat the oval thats all i want lol