Agree. Which was why I checked the Hamtramck Historical Library for TSBs - only thing close was the advice to reduce timing if it pings or try to ge the customer to buy higher grade fuel.
In a thread about 318 timing someone posted a snippet from '69 Plymouth FSM- so I was surprised that its different than the Dodge version. I assume the snippet from the Plymouth version is what he claimed, but there's always a little doubt. Discussing it here because its just would have been a total side track.