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

Beams said
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?

Good question. I hadn't heard of that name attached to 64'. No 4 barrel until 65 but when was the information printed? Late 64 info could be for the 65 4 barrel release.