15 x 8 on barracuda backspacing?

I run 15 x 8 SBP wheels with 4.25 back space on my 69. The springs are in the stock location. The Mickey Thompson 275x50x15's clear the springs by more than 1/2 inch and are just flush with the outer fender. Your 235x60x15's should fit fine. Is your car a right hand drive?