Greg,
I doubt Ron and his guys would have missed this, but I had to trim a bunch off of my outer shock outer tower braces / factory bump stop mounts for tire clearance when I went to that much backspace (I know a lot of mustang guys that just remove them when they go to coil overs). Depending on your camber gain and travel, it looks like the tire could get into it at full bump.
The car looks great by the way. I really like those wheels.
This is how mine turned out:
They still rubbed during autoX runs even after I took a cut on them.
So I cut more and braced it back up with 5/16 rod.
-Craig