This says it all:
https://en.wikipedia.org/wiki/Chrysler_B_engineThe Super Commando was the high output 440, born in 67:
The high-output 440 (4-barrell/mild cam/dual exhausts) was marketed as the Magnum in Dodges, the Super Commando in Plymouths, and the TNT in Chryslers. From 1972 to 1974 the engine (detuned to run on lead-free gas) was rated at 280 net hp, and dropped in hp each year until 1978, when it was rated at 255 hp (in police specification) and limited to Chrysler New Yorkers, Chrysler Newports, Dodge Monaco Police Pursuits, and Plymouth Fury Police Pursuits. It was also available in marine and heavy-duty commercial applications until that year.
