I finally stopped guessing and started pulling the K321 out of the 140 yesterday so I know what I actually have and what I need. It's all disconnected now except the driveshaft. Two bolts for the driveshaft and the engine will come out. Gotta move some stuff around so I can use the cherry picker on it though. The parking arrangement in my shop is like the maze in Maze Runner. The external size stays the same but the configuration on the inside keeps changing every day.
The 4th engine bolt came loose easier than I expected and then I realized why. I just reached under the engine and blindly removed all 4 bolts that hold the engine down. Went by feel. Didn't actually look at them. Turned out the 4th bolt I removed was actually the oil pan plug. It's the same size bolt head and in almost the same location as the 4th engine mounting bolt. Oil started gushing out as soon as the plug was out, but also a lot of water. That really surprised me. It was completely separated from the oil. I don't know how it got in there to start with though. The 140 has supposedly sat inside grandpa's old lawn shed for the last half century. But even if it got left outside at some point I don't see how that much water would end up in the pan. However it got in there though.. it's not a good sign. The engine will rotate
If the 14 HP from the 3 wheeler still won't work I'm pretty sure I can come up with some sort of adapter to bolt the 12 HP Ford engine to the 140 driveshaft. But like I said I don't really wanna do that because it's grandpa's 140. No shortcuts or improvisation. I want it in to be in original working order the way it was when he last used it. Specifically.. the same working condition it was in on the day I scared the hell out of him when he was mowing with it. An odd bit of nostalgic thinking I know.. but that particular memory means a lot to me. I'm sure it meant a lot to him to when I got him too, heh heh . Nobody likes have the **** scared out of them but he took it like a man.