I didn't know 50s still had the octane selector. Just set in on "0" when you set your timing. It allows you to advance or retard the timing up to 10°. It was required when the quality of gas varied a lot.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.