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Tachometer, vacuum gauge and fuel flow meter. Those three will do a lot, though the latter is expensive. I'd pre-heat the engine/trans in advance of any trip (electric heaters).
Fuel injection will make the biggest difference. Steady-state cruising won't be all that different (short of major altitude changes), but start-up & warm-up will be under control in ways carbs can't handle. The engine should show longer life and reduced oil consumption as well.
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