My 23 year old son will be looking to buying a 1963 Econoline/ 351 to that had been converted to propane by the first owner several years ago. (buying it from the second one who had kept it in very good condition overall but been in storage recently). It used to be 3 speed but was converted to an automatic with a floor shift by the original owner as well.
My question is what is to be expected with this kind of gas to propane conversion? What kind of things to look for? What kind of mileage as compared to a gas fueled engine?
I know these questions are rather broad but at least have some idea what He and I are looking at.