[Paul Ceasrine]

There is a good article in one of the early-1967 Magazines,

About the NHRA permitting the use of the 1967 440 Hi-Po Cylinder Heads (Casting #2780915)
on the 1962 Dodge and Plymouth 383 cars with the Dual-Carb 343 Horsepower engines.

With the lack of availabilty of the 1963 {300-J} Cylinder Heads, the NHRA will allow the
1967 440 Hi-Po Cylinder Head (same Valve Size and equal Port Size) as a legal replacement.

Suprisingly, with the lack of 1962 Plymouth Sport Fury and Dodge Model #440 hardtop cars around
(low production numbers) Chrysler made a weak effort in trying to get the 1963 Model Year Cars
(higher production numbers) legal with the 383/343 HP combination sanctioned as a legal Stocker.