You might try to find out what type engine Universal used. There is a 5411 engine that a friend of mine owns and I found out it was a Kubota.
Tis made life real easy getting parts. We went to a tractor dealer and they had what we needed. About the only thing they won't have is the raw water pump and the heat exchanger parts.
If you send a picture I will try to identify the engine.
Still on Island time mon