Guess ET for 318 ? With slicks ???
For my 2 cents, I'm no race expert but did do a little bracket racing when I was younger and couldn't afford good gears so I'm gonna guess that with the tall gears it'll bog so bad at the line that high 15's will be the best to expect. The 4:56 is a tougher call, given the taller tires I'm gonna say you might break into the 13's. BTW, who's collecting the bet money on this thing LOL. Kev