Cragar S/S direct drill lbp

Yes 15" x 7" with 4 1/4" backspace is a good place to start for clearance.

15x8s come with the 4 1/2" backspace. Takes some doing to get just the right tire wheel combo on the Darts.

Would be great if one of your buddies could come by with the nice wheels on his Dart and Try them on your's. Nothing like fitting actual wheels and tires to make sure. You can measure all you want, but in the end they got to fit without rubbing.