Glad to hear you have it running. Install a filter if it doesn't have one, those gas tanks have a lot of trash. Easiest carb in the world to work on. If float gets stuck, carb usually floods visibly, and only runs wide open. Tapping with a hammer will sometimes dislodge it in the field and get you back. Could have also been trash in the jet which drained out when you took it apart. All my stuff is old too.
Can you imagine one of those computerized new kubotas still running 60 years from now? Me neither. I sure could use one though.