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

Buy a usex running slant. They're listed all the time for under 200 bucks. Drop it in and save your money. To do the 440 swap 'right' is gonna cost some cash. Wait until you can afford to do a quality swap and not need to worry about mpg. Just my 2 cents..