Looking for more 408 pull at the big end?

Something wrong with the tune... and are you using the NOS shot on that run?????
Have a friend that run 7.3's in the 1/8 with a 1.6 60 ft. stock stroke 340 with eddy heads, cam around .500 lift. pump gas, 4.11 gears and a coan converter. Your combo should make more power than his easily with the NOS shot.