Timing help needed

HAd the dizzy put on a suntach machine (or similar) and come to find out the 18 degree MSD bushing is actually 14 degrees and the advance they say is supposed to be all ion at 2,000 is actually all in at 2,500

Those of you with MSD distributers, i'd have them put in a tach machine and see what they are really doing. DOn't rely on their charts.