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AJ/FormS, That was quite a discussion with lots of excellent information. You definitely had time on your hands to make all those measurements and good skills to know how to chang the springs and such to make the distributor do what you wanted it to do. What spring kit did you use? And what...

Initial timing (seen on the crank at idle), Mechanical Advance (measured at about 3000 RPM or when springs are fully extended), and Vacuum Advance all contribute to total advance which must vary based on engine speed and load. Best power on a SBM is usually achieved at 34° Crankshift advance...