I've got a '68 Fury wagon that I’m going to swap a 383 or 440 into. Not looking for a race car so a 383 would probably be enough power but it seems to be easier to find a 440. How much difference in fuel consumption is there between a 383 and 440? I’d like to get somewhere near 15 mpg at a 70 mph cruise with a 727, 3.23 gears and 235/70x15 tires. Is this a reasonable aim with either engine?
