Two of the common spec numbers for this tractor were 71147 and 71355 of which shortblock 45 522 40 works for them. To use the 47807 or 71358 engine, you will have to remove the oil pan and use the pan that is welded in your frame. You will also have to use the stub shaft that is currently on your engine. The wiring could also be slightly different.
Additional Info
The oil pan was welded into this frame and also held up the front axle.