318 build #2 "cost minded" for the '74 Duster

toolmanmike said

Or 920's from a late 66 and 67. Those could really use some bigger valves. and bigger ports and some bowl work done, and.................

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Yup those would work as well. I was trying to keep my recommendation within the bucks down approach as @318willrun said from the start. Guess it comes down to what heads do you have on hand, and how much work are you able to do yourself to them to keep costs down.
WWAJD (what would average joe do?)