I plan on getting 15"x3.5"(maybe 15"x5") Weld Pro Stars up front, and 15"x10" Pro Stars out back. Possibly wrapping the rears with 26"x11.5"x15" tires. I have a 1998 WS6, but my buddy has a 1998 Z28 and has that exact setup and says it does not rub at all and he did no modifications. Is that possible? What backspacing would be needed for the front and rear?