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Re: 1972 Longhorn
If you are concerned with fuel economy, you won’t achieve many gains based on how you build the engine - it’s a carb’ed 350 so it’s gonna get what it’s gonna get, just keep it tuned to factory specs, perhaps add electronic ignition. If you spend a decent portion of your time above 55 mph (or would like to), fuel economy is best addressed with an overdrive trans (which doesn’t sacrifice 1st gear torque) or a rear end swap (which does).
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