The six bbl (six pack of a Dodge) was an option starting on the 69-1/2 A-12 and optional in 70 and 71 as well. The standard 440 was a 375 hp rated four barrel.
Thanks for the reminder, I remember the 440 super commando being base engine option in the superbird, and the '71 GTX roadrunner, things get a little blurry sometimes.
