a longer swinger or a wheelie bar also, my fast ported 421 cub still carries the wheels 3-4 with a + 12 and im + 3.5 in front to... american racers are good drag tires mine ar 20.5x10x10 d-23 compound. you wont be able to spin the amer racers much, so if you know how to set up your lockup clutch to slip then grab just the right amount it will also help,
i have a plus 8 tyson arm for sale with one ride on it if your intrested..
pm me if you want more info on a clutch setup..
chris