Mike in New Zealand here.
Have had plenty of pratice here. You want 36 Total & around 20 degree's initial.
Only way to do this on stock dizzy is weld-up the slots that advance weight posts slide in.
Easy way is weld in more than needed, probably about 1/3 of length of slot & round file it back from there. "You'll get used tio pulling it apart."
Use a heavy & medium spring; but myself, i only have one light spring & as soon as it starts, it has full advance. Only slightest clatter in top-gear to about 1400 rpm. I do have good quench though.
Hope this helps.
Mike.