15x8 Magnums on a 68 Dart

I picked up my parts car (75 Duster) yesterday for 5x4.5 disc change and 8 1/4 rear.
Has anyone run 15x8 60's without rolling fenders or other mods? What size and brand tire are best (a good price is important). I would prefer the same size tire for rotation. The rims are not perfect and I havn't cleaned em up yet.