Wheels and Tires on 1978 Z

I'm getting ready to put some 15x10 Weld Draglites on the back of my Z. And planning on mounting up some BF Goodrich Drag Radials P325/50R-15s. Think I'll have any problems? I am getting a 5 inch backspacing on the wheels.

Thats a pretty damn big wheel man. The biggest wheel I have heard fit in a stock wheelwell is 315/35/17 which is almost 2" shorter. That was on an early 2nd gen and I have not seen it for myself so I do not know how well it fit.
Good Luck.
CoryM