These are the wheels http://customwheelsmarket.com/d650782.html
I was thinking a 245/45 on the front and back.
Would do you guys think..........

Sounds good to me.

wider in the back (i think) looks better
245/45/17 Front 275/45/17 rear?
but graboids 315's are unbeatable.

If they are both 17x8 you should go 255/40-17 front and rear... if you put a 275 on that 8" rim you'll have to run lower tire pressure to get full tread foot print

they need to make those IROC rims in a 17x9, 17x10, 18x9, and 18x10.... but they arent smart enough

On the 17x8 you should relistically only run as wide as a 255 on it. Get a 17x9 you will be better off.

Adrenaline: I don't have 315's in the back. They are only 275's

I have 285/40-17 on a 17x9 and I have to run them at 32 psi to get a good full foot print