I'm in a delima and need Pics of F-bodies w/ 18x8's all around

[av8or32]

I found some wheels I really like (Boss Motorsports 338's) but they're only available in 8" wide. How wide of a tire can I run on an 8"? What backspacing do I need on a stock 69 Firebird w/Hotchkiss TVS kit (lowered 2-3") Can someone post/send pics of a similar set up? I wanted to put as much tire out back as possible and was wondering what was possible with a fat lip design like these.......there similar to Coy's C-5's for reference.