Jacob’s ignition testing. Thanks to Newbomb Turk….

In the video, I assume the Allen's tach is in distributor RPM.
So double that for crankshaft speed.
(edit: crossed out because its incorrect. See Newbomb Turk's reponse below)

'Larger spark'.
A spark that can initiate with a larger spark plug gap has potential to create a larger flame kernal.
or with a smaller gap, that voltage can be used to initiate a spark when conditions are more difficult.

The next part is to have enough energy to keep that spark going while the kernal develops. That can be useful with less than ideal fuel/air and combustion conditions, or if one is trying t ogrow a larger than normal size kernal.

Is there an advantage? Depends but potentially yes especially when conditions aren't ideal.