I'm about to order a diff for my 65 A body. I'll be relocating the leaf springs in to the frame rails. I'm wondering about the specifics as far as measuring what width one should use to gain as much tire clearance as you can. I haven't done this before, and I don't just want to throw out a measurement off the top of my head, not knowing it may effect the result. How much clearance do you need outside of the leaf springs? I'll be putting drum brakes on the rear, and i want to get an idea of what I'm restricted to when ordering wheels as well. I'm told that a Dana 60 can only be narrowed to 56" which seems pretty wide to me.