Mopar 440 ~ 1967 vs. 1968

krazykuda said

Didn't they revise the ports on the heads from 67 to 68? In addition from going to open chamber. Which heads have the better flow?

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There was no big difference between the #2780915 {67 440 HP} and the
#2843906 {1968} Cylinder Heads in Flow.

The 1968 Intake Ports were 'revised' and do provide for a slight increase in
CFM Flow {Between .350" and .500" Lift}, which is somewhere in the range
of 3% to 5%.

The Exhaust Ports flow at near identical numbers.