Big Block Cylinder Heads "915 vs 906"

Back in 1968 or 1969,

Super Stock & Drag Illustrated or Car Craft Magazine had an article on
the 67' 440 'HiPo' Cylinder Heads, and called them the 40 Horsepower Heads.

Back then they were all the rage.

You could pick them from your local Mopar Dealership Parts Department for
a crazy low cost, something like $125 for a set.

The Heads and a 'Street Hemi' grind Hydraulic Camshaft, pretty much guaranteed
you about a '1/2 second' off your Elapsed Time.