wheels and Tires for a 64 Barracuda.

4-4.5 with a 15x7
Need some advice folks. I would like to put 15" wheels and tires on the fish, 225 x 60 x 15 on the rears and 195 x 60 x 15 on the front. My question is what back spacing on the wheels do i need?

toolmanmike i posted this in Jan. of this year and you responded to me, but i have one other question for you if do not mind. Is it 4" setback on the front and 4.5" on the back?