The 4 inch backspacing will really limit you. I received my new wheels that I mentioned above. I haven't installed the 12 bolt chevy differential yet, so I am running a stock width rearend for a 68/69 GTO/Lemans. With my 4 3/4" backspacing, the tires are offset toward the outer wheel opening. If my suspension compresses to the point that the widest part of the tire is right at the outer lip, it will have 1/4" clearance with my 275/50-15 tires.
With your 4" backspacing, this tire on your car would be interfering with the outer lip by 1/2". Not good. You will have to run a much narrower tire than me, unless you want to really raise the back of the car up. Or get rims with more backspacing. You should be running 5 1/4" backspacing with an 8" wide wheel to get it perfectly centered in the wheel house. You would need to make sure that the lower shock mounting hardware does not rub the rim on the inside. It should just clear. If not, use 5" backspacing. You could mount your 4" backspacing wheel and measure how much room you have between the rim and the shock and then determine if the ideal 5 1/4" backspacing would work.
Once I install the narrower 12 bolt Chevy, my rims will be perfectly centered.
Good luck!
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