275-60-15 tires on 67 Barracuda

I just called my buddy he put them on.

275-60-15 on 7" SBP 4.5 BS 15" wheel. With 20psi He said they fit. 1-1/8 clearance in the front, 1.25 to the rear, but only 1/8 to the spring. He said 4.25 BS would have been the perfect wheel for spring to lip to fit using this tire.