Yes the Harmon Collins adjustment plate fixed the issue of not having adjustable timing. ( at least not easily adjustable
)
The issue with all the early Fords was the case either helmet or crab wasnt movable once mounted. A good thing for the Ford service dept and service techs as the chevy guys was cranking the timing up and down in every gas station in the country.
Many figured out the mods to allow some increased spark timing and advance, but in reality there was another constraint, and that was "rotor phase" you can only move the point set so far until you have spark scatter with the rotor being out of phase with the cap contact!
