8 inch wide wheel backspacing stepper

[68Stepper]

Will some of you stepper guys chime in on this? I saw several threads on this but nothing that answered my question exactly.

I'm in the process of doing a 4/6. I'll be using the stock 15x6s in the front which I believe have 4 inch backspacing.

I plan on ordering Wheel Vintique 15x8s for the rear. My question is what is the recommended backspacing for the rear 15x8s? I believe that it's between 4 1/4 and 4 1/2 but I'd just like to double check before I order those wheels! (I have the factory 68 rear end)

Lastly I plan on running 225/70/15s in the front and 235/75/15s in the rear!

Does all of this sound okay? Anything I may need to look out for?

Thanks!