Here is a scientific procedure that you can get pretty close to timed correctly with. I think on your engine the chart setting they ask for in the first photo is 6 degrees BTDC. The test light method is easier because you don't have to look directly at a meter but a VOM could be substituted. Connect the meter the same way they say to connect the light. Instead of bulb going on the meter will read 6v when points open.
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