Suggested wheel size for rear

Hi guys ,

I am open to ideas about rear wheel size .
This is a really sweet original car,,,,I’m not going to cut or tub the rear quarters .
I am going to cut the rear housing down to 51 1/2 end to end .
I’m planning on moving the perches in to 42 center of each other.
The springs can be moved inboard about an inch to fit that .

My real question is will a 15x8 fit ,,or should I stick to a 15x7 ,,,,I think an 8 inch wheel will fit ?,,,,but I want to listen to experience .
I’m planning on using Cragar because I always liked them when I was young .
But I’m not certain what backspace is available,,,,I’ll use 15x7 if it’s the best .
I want it to look and fit good,,,,but not damage the tire or body .
Thanks guys for any help you have .

Tommy