That combo should work for you.
On my 67, I'm currently running 15x7 Magnum 500's with 235/60/15 tires in the back. The backspace is 4.25". You could go with a 4.5" backspace and still have room on 15x7 rims -- 15x8, I'm not sure of the backspace you'd need. My driver's side rear tire rubs very slightly on big bumps -- it wouldn't if the axle was perfectly centered, as the passenger side doesn't rub at all ( soon to be fixed ).
On the front I'm running 15x7 wheels and 225/60/15 tires, with a 4.25" backspace, and they fit fine. Any more backspace on the fronts and you may run the risk of rubbing the suspension.
There's pics in My Photos if interested. Good luck with your decision.....
67 XR7 - Tiff. Blue, 289, C4
13 Ford Focus ST
90 Mazda MX-5
95 Ford Probe GT/68 Cougar Trans Am tribute LeMons race car
03 Ford F150
83 Honda Nighthawk 550