Thanks for your work in maintaining this site for all of us.
Respectfully, some notes for correction. Dodge, not Plymouth, marketed the "Magnum" engine name: Plymouth used "Super Commando." Second, the 390 hp figure related to the 440 Six-Pack, not the standard 440 Super Commando (4-bbl), which was rated at 375.
Also, a group of us who have spent decades studying such matters are unaware of any unmodified Road Runner 440 car running into the 12's. They can do it, but typically they require the addition of drag radials, uncapped pipes, a related tune and the lowest rear gears.