Wheels for the back of an A Body barracuda....?

Hello
I need some help here, just about to buy new rims for next yr and found some nice rims for sale at jegs.
I wanted to know can I fit 15 x 8 wheels with 4.5 beck space on the car ?
All stock in the rear when it comes to leafs and frame... Nothing moved in etc.
In going to go with the 15 x 4 front (cant recall their backspace for the front, but I'm thinking that won't be a problem) outs just the back rims I'm worried about.
While I'm asking, anyone know what the front should be ?

Thanks.
MAPS