Wheel to spring clearance

Working on a 70 Dart 2 door with an A Body 8 3/4 rearend. Just wondering what is the maximum back space wheel a guy could use on this? I want to buy some 15" wheels when I get the axles re drilled to 5 on 4.5 pattern. Can I use an 8" wide rim on this ? Thinking about using Centerline wheels. Do these come with a 4" backspace? Thanks