15x8 magnum 500s on front of 70-72 valiant/dart/duster/demon?

I am looking for a pair of 15x8 magnums for the rear of my barracuda. If you want to sell PM me. I am going with 15x6's in the front with 215/60's to keep the tires in tight to the cars centerline. I planned on getting 15x8's for the rear with 255/60's. Might be good for both of us if you just want to sell the rims bare.