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I do not know the number stamped without checking the arm, but this rough running issue just started and one of the things I did do was use a vacuum pump to check for plate movement. The plate moves.
I now have changed the points, new plugs and rebuilt the carb with no improvement. My dwell...
So.....a vacuum advance really does not advance the timing at all, but retards or controls it.
Vacuum chamber is another term used in place of vacuum advance, and is a more accurate descriptor.
I am experiencing a 383 engine running rough at lower rpms and part throttle loads. It's a 4 speed...