Restoring a car that has been sitting in a field is a very time consuming and expensive hobby. Not a lot of people want to devote the time and money required. And there are plenty of people who are not into cars at all...they are just something used for transportation purposes.
Nitromethane, methanol, lube oil. That is what Google says.
The engine is very basic and functions similar to diesel (glow plug). I don't think they have valves. The burnt fuel exits through a hole in the side of the combustion chamber.