Those huge secondary barrels do have a distinctive sound, but if the secondary air valve torsion spring is adjusted correctly you shouldn't be able to feel a difference in acceleration as the transfer from primary to secondary air flow happens. There should just be a smooth change in RPM, but with that big block it should plant your spine firmly into the seat back!
That 454 should be able to pass anything but a gas station! Yes, the 1st. gear ratio on the 700R4 is lower, but the tall tires probably still need a gear somewhere in the low 4's. The rock crawler guys love those 4.56's and 5.13's to go with their big wide, tall tires.
Jerry
