Backspacing Help!

[O'Neall]

I'm gonna need some advice on backspacing for some 17x8" (front) and 17x10" (rear) wheels for my 1977 Trans Am. I'm planning on running 245/45R17 up front and 285/40R17s out back.

From what I've seen on the internet of other 2nd Gen T/As & Camaros with these size wheels/tires, front BS runs anywhere from 4" to 4.75" and rear seems to be either about 5.25" or 5.5".

Any fellow 2nd Gens out there running these size wheels/tires that can give me some first hand experience/advice?

Thanks!