73-76 A-Body Offset

I have a 73 Dart Swinger that is all stock with LBP 5x4.5 American Racing Outlaw IIs that are 14 inch with 205/65R14 all around. I want to run 15 or 16 inch. I'd run 235/65R15 on rear and 225/65 R15 up front if i go with 15s. Anyone running 16s? If so what sizes would you recomend? Thanks for any help!