help please

[mcompound]

okay I just ordered a set of bonspeed huntingtons for my 67 camaro that has been lowered 2" all the way around. I checked everything last night, but now I am second guessing myself. The tires are 215/45/17 for the front and 255/50/17 for the rear.

I ordered 17x8's with 4.75 backspacing for all 4 conrners. Did I screw up? I am afraid that might be to much backspacing for the fronts.

Please help, there may still be time to change if I need to.