Sorry, most of my pictures are held hostage by Photobucket so blame them if you can't see.

I am going to have to retract my previous statement of possibly fitting 335's in the rear. My setup is actually rubbing in the upper wheel wells upon further inspection. It must be rubbing due to the body roll while cornering. The rubbing is just slight on the tire but, is no way ideal.

315's are definitely attainable, no doubt. With leaf springs, one will have to relocate them inboard 1.5" using Dr. Diff's kit and roll the rear fenders. Once those two things are done its just a matter of finding the correct offset wheels.
I am having more issues fitting them in the rear than in the front haha!