7 inch back spacing?

[Yenko boy]

I have a 69 camaro that has been mini tubbed with the DSE kit. I can get some rear wheels at a really good deal but they have a 7 inch back spacing. Will they fit appropriatley on my car? Wheels are 18x12.5. Just wondering if they are going to fit right and the pros and cons a 7 inch vs 5 inch back spacing.

Thanks

[ProdigyCustoms]

You will need about 8 to 8.5 backspace on a 12.5 wheels