1967 Barracuda - Slant Six (orig) or 440 Big Block? Daily Driver, Need MPG

Numbers matching slants will be rare if more people do what you do... :/ TBH, I wouldn't mind finding a slant six powered A for a driver. Unfortunately old mopars out here are not common and made worse by being smack dab in the center of some of the least populated part of the lower 48.