Too many people think that replacing points is all that is needed to have a good distributor. But the sad truth is that the shaft, bushing and springs all wear out! If you really want to scare yourself, put a timing light on the front pulley or flywheel and watch how the light dances all over the place! While a new distributor will not remove all this inconsistency, it should make a major improvement! Now no longer rebuilt but new units - no core charge!