I realize this may be hard to answer, but I have found a 1936 F-20 for sale and when I checked it out I noticed a few things like the Heisler bellhousing and ring gear for a starter. The starter is missing, however. The manifold is the all fuel one, but I have not seen any in better shape. The thing most interesting to me is the gear shift cover has 3rd and 4th switched, indicating the factory high speed 4th gear. The tractor is on cut off wheels, tires shot, but engine loose. I am just curious if these options or add-ons are desirable enough to pay a little more for an otherwise average tractor. Thanks you for any advice. BT