Service bulletin for the new for 1964 "273 V-8 engine"

toolmanmike said
Dodge was the Charger. Plymouth was Commando.

I know that much…but it says it’s the 180hp version. I thought the Charger/Commando name was only used on the 235hp motors.

So did they call the 180hp version Charger/Commando for only 1964, or did they make the 235hp motors available partway through the 1964 model year?