Corrected Horsepower Factors > 340 ~ 360 ~ 383 ~ 400 ~ 426-S ~ 440

That would be the 1972 and 1973 ~ 400 4-Barrel {Engine Code "P"}

That Engine was available in both the Plymouth Road Runner and Dodge Charger 'Rallye'.

And Charger SE badged as 400 MAGNUM.....

I wasn't sure if the big Chryslers with the 400 4 barrel were a "P" code or were they even offered in them?