On this one the rear is moved back probably 1/2" or so. Rear is shortened. Mini Tub. 15x12's with 4.25 back space. 325/50/15's Drag Radials , 315/60/15's will fit as well as 29x10.50wx15 Mickey Thompson Slicks.
You have that rear end / tire stuff right where my Demon is. I have 315/60 MTs but haven't been able to get them to work as well as the 10.5W slicks. You will be shocked at the launch the first time you turn the trans braks loose at stall, so be against the headrests! Did you get the cage cert'd?
And you may have blown the sleeper looks thing. Nice job getting the crotch straps integrated with the bench seat.