Back in those days Chevy's 307 was about as well respected as a Dodge 318, both were reliable but no power house. I think both were only available with 2 barrel carburetors. I would think a late multi-port fuel injected 305 or 350 small block engine should deliver better power and better gas mileage than the same size carburetored engine even with modern pollution controls. An overdrive transmission would also improve mileage. Fuel injection and overdrive would not be period correct in 1968.
If you no longer use the truck for heavy hauling, it might be simplest and cheaper to just change to a lower rear axle ratio or swap out the entire rear axle. You should be able to find a list of the period correct rear axle ratios on some of the online Chevy truck sites. Did they put any two speed rear axles in one ton trucks?
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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