Initial set, after mag had tripped, to a fraction after TDC (to prevent kick-back) - engine was turned backwards past TDC after mag tripped, then forwards to TDC, for the static set.
When running, designated plug lead was flashed in timing hole near to flywheel to illuminate the timing mark at rated speed.
Timing was then adjusted to optimum for fuels of the day. They often recommended a hat, or similar, was held over the area to improve visibility of the timing marks by reducing the ambient light level.
Just remember those fuels are not available now, so optimum timing may well be changed.
No reason why a modern timing light should not be used instead of the spark flash.
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