69 GTO rear wheel backspacing?
 

I have a 69 GTO that is at the body shop. I would like to get the new wheels and tires for it. What is the best backspacing for the rear wheels. I would like to fit 295/60 15 tire. would a 15x10 with 4.5 or 5.5 be best? The lip of the wheel well has be rolled up.

Thanks for your help.

Don't roll the lip...you'll regret it later...