I recently went through this, not an expert, just watched multiple videos, searched forums and the interweb.
I found most videos contradict themselves in the same video, as well as other videos, and leave out steps.
My ready to run dizzy was set at 20* btdc.
I set my crank there, then set my pickup at one of the pickup spokes, and also set my adjustable rotor at the #1 cylinder.
The adjustable rotor wasn't far off from it's center mark.
Cut a hole in an old cap, marked a line on the rotor, started engine.
Phasing was setting the rotor where it sweeps across the #1 post during a specific rpm range, in my case idle to 4k, iirc, according to the efi specs.
The rotor is now always as close to the post as possible at all rpms, and the pickup is lined up.
I found mine runs best with the rotor just past the post at idle, and it sweeps back to on it at 4k, and just before any higher.