Actual results can vary from car to car. Assembly tolerances when new were lousy and you put 50 years of neglect or abuse, and the results will vary even more. Some cars can get 6* with these, some will struggle to get up to 2*. In either case, it can give a 2-3* of additional adjustment over the standard bushing. For a few bucks more than a standard bushing, why not try them.