833 Gear Pitting... Help!

Came out of a Leaky ole shed so yeah.
No side cover on it..
In that case, I'll bet the water washed all the oil out, and your cluster is fubarred too. At that point I'd be more inclined to throw it all away. And here's why;
If water got into the cluster, then the bearings and the pin will be toast. And the bored hole in the cluster, where the needles ride will be probably the worst pitted of all, and there is no coming back from that. You cannot buff that out, and even if you could, there are no oversize needles that I know of for that application. If you just slap it all together with a good cleaning, the cluster will fall down a few thou, forcing all the mainshaft gears to run on a different part of the cluster teeth. With the already compromised gears, this is just waiting for a disaster. It might survive a slanty for awhile but an overhaul kit with new bearings, is not cheap, and if it blows up in a week, you'll be a very unhappy camper.
@xLURKxDOGx already posted a way better idea than re-bearinging that water-logged beast of yours. If his does not have the flange drive, you should be able to convert it with your parts if your M/S has survived.