Propane would be extremely simple to add to your truck and a mono-fuel conversion would be similar to the
1963 Rambler Conversion. As mentioned earlier, you will need a
propane carburetor, converter, fuel lockoff, and a fuel tank. Your propane fuel economy will likely be 75-80% of your gasoline economy. Ideally, your timing advance would have to recurved to have optimum fuel economy.
Dual fuel is another option.
As for earlier points about propane-fuelled engines, there is a slight power loss for two reasons: propane (as a gaseous fuel) displaces some air from the combustion chamber and propane mixers typically only provide the maximum power fuel mixture at maximum air flow. The air displacement (~4% compared to less than 1% for gasoline) results in a loss of volumetric efficiency. The lean fuel mixture at low RPM is due to the design of the gas metering valve in the mixer.
Also, propane's effect on exhaust valve seats is similar to unleaded gasoline. The reason people have burned exhaust valves is because they set the fuel mixture too rich. Propane responds opposite to gasoline because liquid fuels provide an evaporative cooling effect while gaseous fuels do not. It is always safer to run leaner fuel mixtures in a propane engine.
The only reason to convert is for economic reasons. If you drive a lot and there is large enough difference in price between propane and gasoline, a conversion could make sense for you.
