Good. Now that you know what you are looking for DOUBLE CHECK the outboard model
and the magneto model. There are several vendors on AOMCI site who may be able to supply
what you need from a parts motor "out back" Place a wanted to buy ad on AOMCI free
ad site. McCulloch bought Scott Atwater so prior Scotw Atwater may have same
magneto.
Lastly be sure the motor you intend to repair has no major issues before you buy parts.
Sometimes an old outboard is beyond help.
Louis