This may or may not be visible to your eye HOWEVER the points were replaced by a rotor that has small magnets (like high cam lobes) which pass by a tiny pick up coil which triggers the elec switch to open just as the high cam lobes opened the points.
Soooooo if those teeny magnets (rotating part) and the pickup coil location (fixed part) are visible to the eye?????????????????????????????????????????????, the spark would take place when the rotor tip is correctly pointed and the rotating magnet is just passing the pick up coil.
I doubt that's visible so likely no help but its all I got lol
Or else, have a plug wired up outside where you can see when it fires??
Or else, if a 6/12 VDC test lamp is placed on the distributors small side terminal INPUT or coils (to dist teminal) OUTPUT and the engine is rotated slowly, the spark takes place when the lite flashes ON. That's when the rotor tip aligns with the correct cap terminal,,,,the magnet passes the pickup coil,,,,,,,,plug fires.
Theres more I overlooked but have to get back to mowing before it rains
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