New Thread...propane powers cars (Score 0, Offtopic)

I am new to the list and do not yet know how to start a new thread.. I am interested in converting a 74 VW bus to propane power. I am originally from a farming community where it was quite usual in the 70s(to see tractors run on propane or butane. I found some reference to the topic earlier on this list...anyone care to share information? thanks..