Too much backspace is FAR more desirable than too little. (Except in your case, cause you don't have a problem cutting the fender, lol)
With too much backspace, you have the option of using a spacer to put the tire Exactly where you want it. With too little b.s, you don't have that option.
I have run 9 second quarters with rear spacers, but they are quality billet spacers I made myself. If you're gonna run spacers get the best you can get, not the cast multi bolt pattern crap.
