Got Cragars, will this backspacing work or do I need to exchange?

[HunterRotten]

Sooooo.. sorry to triple post but we have come up with a viable solution after bolting up the inner fenders to the bed. I think it will have just enough clearance to only dig into the sidewall on a 15x10 Cragar S/S with 4.25" backspacing and 295/50/15 tire when under load or hitting a large bump. (Not at current ride height.. read above to see how I'm going to raise the truck up.) To gain even more clearance so that it hopefully never happens, we(my dad) are going to fabricate up a shim between the bedside and bolt-in fender made out of 3/16" steel. This should push the bedside out just enough to the extra safety and comfort of running a wheel with this offset + wide tire.

If we are wrong or totally backwards, go ahead and post. I have read every comment and taken all suggestions and situations into consideration and theory with my dad. I think after the shim is welded in, seam sealed, and then bedlined it won't look a bit out of place.