The Mag, the carb, the pinion assy are all marketable parts. The freight on the engine would be prohibitive. Not that rare down here. There is 1 oil port and 1 water port on the block that need to be plugged after removal. PS that is a nice looking grader you have there. I have a 1941 that is going to be a parts tractor. My 1949 just seized a rod bearing but the 41 pony is the same block.
Does the pony have a electric start? The starter assembly is nice to have if you have a rope start.