Here are some tire pics from a couple of my Z/28s with radial tires.
The red car has 215/65/15 on the front and 245/60/15 on the rear. The rear is a 15 x 8" wheel.
The blue car has 235/60/15 on both front and rear. Personally I like the set and stance of the blue car better. In fact, I am currently shoppping for tires for the red car that I can mount on 15 x 7" Torque Thrust-D's...I am leaning toward 235/60/15 on the front and 245/60/15 on the rear. Suggestions?
I hope this helps.
Rich