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I run 17 x 12 CCWs with 315s on the rear of my '85. I've never had a problem. I'm not sure of the backspacing. I'm sure if you called CCW they could give you the answer. If you need any changes they can do it for you.
My next step it to go 17 X 12 all the way around. Kuhmo wants me to run 315s on all 4 corners. You find some pictures on my blog.
no it wont fit...that backspace leaves you with over six inches towards the outside. My Zr-1's have almost a seven inch backspace and only three plus inches on the outside and they stick out 1/2 inch on my 87 vette. 12 inch is too big