Hi guys... I have a 91 mustang coupe that I have mini tubbed, with a stock width diff. I recently caged it and i'm now running Qa1 coilovers out back so tire space is not an issue. I already have moser 31 splines with 4.10's and c clip eliminator with a spool so i'm not in a hurry to fuss with the rearend. When I throw a tape to the inner fender well, I have 14.5" from the back of the inner tub to the outer lip of the fender. What backspacing do you guys think i'll need? I've read lots on this from lots of other guys but everyone's using narrowed diffs. Please help!!