Thinking it over, the angle (if 36 degrees) only measures from the single dot to the three dot position and not necessarily from TDC.
To determine TDC, remove top spark plug, line up the single dot with the timing indicator, insert a screwdriver, dowel, etc. into #1 plug hole and rotate the flywheel back and forth while watching the screwdriver go up and down.
Screwdriver max up indicates TDC and single dot should line up with the timing indicator.