The Specs posted in the 1957 Shop Manual show Vacuum Advance Specs and Centrifugal Advance Specs. Are these Specs doubled at the Crankshaft or are these Specs what should show at  the Crank using a Timing light.? I have set my Timing at 10 BTDC initial and when manifold vacuum is applied its showing about 36-38 Advance. Is that what it should be based on the Shop Manual Specs? I am using an actual 1957 Distributor with the Ball Bearing Advance Plate.