Rear end alignment issue 1969 cuda

It was an inch on my car with SS springs , the Chrysler book says it should be 1/2 inch to allow for the different spring rates ,the passenger side is the torque side and compresses more under load , the 1/2 inch disappears and the car launchs straight .There are a number of threads on here regarding this factory offset . I made a spacer to correct mine to 1/2 inch .