Largest size wheels.

My brother had a '71 Dart with SS springs and I fitted a 27560R15 tire on a 15X7 police wheel with no suspension mods. I could fit my fingers between the fender lip & tire. Maybe 1/2 inch clearance. You might need to roll back the fender lip to be safe. Can't remember clearance between rim & springs but it "did" clear. At the time he had a 25560R15 on the car. Hope this helps.