I'm looking to buy a mickey thompson ET street radial tire. What tire size would you recommend buying to help with correct gear ratio for 1/4 mile racing?? I have 355 motor shifting ,6700 rpm's,350 transmission w/3000 stall,9"w/4/11 gear. I have 255x60x15 on rear now. That's a 27" tire, i'm worried about clearance w/275x60x15, frame is not notch or lip rolled. I do have dbl. adj. control arms and rear disc. conversion kit to help . That tire is 28" tall,the same as my hoosier drag slick,it seems like i'm running out of gear w/ that tall of tire. Any one running 235x60x15, and able to still hook??? That's a 26" tire.