Modifying the upper front control arms to increase caster would rotate the tire/wheel away from that front edge of the fender, a bit. It centers the tire/wheel better within the fender arch. Ford's upper control arm modification to reduce caster is what pushed the front tires forward!
The 215/60R15 tire is 25.2" in diameter, a smaller diameter tire would also create some clearance (225/50R15 = 23.9 diameter, 205/60R15 = 24.7 diameter)
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