tire and wheel sizes for rear wheel wells on 72' cheyenne super swb

[snipescastle2]

Hello all!
I am sure this subject has been discussed in the past, but I had to ask. I was wondering what is the largest (widest) 17 rim and tire combo that will fit a 72' cheyenne super swb without tubbing the rear wheel wells? I'm just curious if a P315/35ZR17 tire and a 17" x 11" rim would fit, and if so, what kind of back spacing would I be looking at? by the way, the truck has a 4"/6" lowered stance just so you know. these tires have a tread width of 12" across, so, probably not without tubbing, but I wanted to see if anyone else has done this before.
Thanks in advance!
Ben