Mmmm...I'd say it's too much rear spacing!...I have some 15"x10's with 275-60-15's. The rear spacing of the wheels is 4.50" and although it fits real nice, I think it's the most rear spacing you can use! Anything more than that and you're very likely to have some tire/frame rubbing issues, unless you decide to notch it.
My steet tires are 275 60 15 drag radial on 15 x 10 w/ 5" back...... this is the max back space you could have, I get a slight rub on turns or corners.