backspace?? 67 firebird

[ricer]

So i have done some rough measurements and just wanted to see if i am overthinking this or not. (so really more of a confirmation than ??)

Car is a 67 firebird mini tubed, with springs moved inwards similar to the DSE mini tub kit. The wheels i want to run are 17x11 with a 325/45 tire. stock width axle

I measured from the flange face to the spring since that is the first "obstruction" and i come up with roughly 9". From the flange to the fender lip i have roughly 5". Going from 10 o'clock, noon, to 2 o'clock i have anywhere from 13-15-13" from wheel well to fender (so actually slighltly less to truely work with).

the tire has a section width of 12.6 and fluff that up a little to take into account the outside lettering etc that they leave off and spacing around it i figure on 13" of tire space that is needed.

So with a 17x11 if i run 6.5 BS that should leave me 1/2 from the lip and a couple inches from the spring. My options on BS are 6.5, 7.5, 7.75.....so my other thought was to get the 7.5bs and run a spacer to "fine tune" the wheel spacing in the wheel well.

After finding the wheels i want and going over and over the BS/measuring stuff in my head i am starting to second guess myself and just wanted some outside opinions.