BIG SLICK ON A WAGON

Right now, I'm going by the spacing of a factory 14" wheel and tire(I know the 13" standard). The spacing between the the outside of the tire(facing forward) and the most front of the rear wheelwell doesn't look like much spacing. A 15" wheel with a 29" tall slick and there will be major rub with the wheelwell and the outside sheet metal. Considering that the wheelbase is 106, that's a tight fit.