456 gears

Im not an expert on this but just because you hold 7.5 pounds of fuel doesn't mean you are getting enough fuel. Your running a mechanical pump, pulling fuel from the rear through a 1/2" line? What regulator are you running? I have a mid 700HP 500BB and everyone i have spoken with pushed me to upgrade my GB280 and reg to a MagnaFlow500 and bigger regulator. BG even said the big two port reg that I was running wasn't big enough. Hopefully someone more in the know can jump on this and correct me if Im wrong. Are you sure about your cars weight? Are you spinning the tires a lot?