I've got a Jubilee 134 engine that blew rod No 1 through the oil pump and cam and out the side. I had the rod journal ground 0.010 undersize. I found used camshaft and oil pump and piston and rod. I had a friend weld in a piece of thin stainless steel that was domed up a bit, so that when it shrunk it had some give in it. I'm going to try it in the tractor. Bought a 172 spare just in case.
This same friend has a skidsteer engine that spun bearing on No 1 rod of the 3 cyl engine. He's trying to fix it up, but might find another engine. He's located in MN. You used to be able to buy an India-sourced new engine for just about the cost of rebuilding. They were built for Farmtrac tractors. It's possible that the Montana-Branson dealers might have some.