I gained the claimed 1/2" spring clearance for each side on my 64 Barracuda. I narrowed a C-body axle housing to be 1" narrower than the factory A-body housing and that centers the wheel in the wheel opening. I have 245/60R15 tires on 8" zero offset wheels. The result is 1" clearance to the outside of the springs and approximately 3/4" to the inside of the inner wheelhouse. My car is slightly raised so it leaves plenty of room. Might get pretty snug on a lowered car.