Tire Size Question

[LIL QIK]

I apologize if this is out there somewhere but I couldn't find it.

I need help on what the largest tire is that will fit on a factory stance 68 SS 396 car. If you could please provide the height and width.......also will a 15x10 fit back there and if so what's the backspace needed to do so. Also need recommendations on what the backspace is if I use a 15x5 on the front.

Thanks for any help offered..........but I'm new to the first gen scene. :o