Again, not sure just which engines you are referring to…I think the three cylinder 25/35s were introduced in 1996. In any event, you are probably better off going for the 1982 2cylinder for all the reasons mentioned…Simpler, more reliable, easier to find and cheaper repair parts….
Those three cylinder engines were nice running, but plagued by cheesy add on pieces such as the oil injection/fuel pumps. They are definitely harder to service, more complex, less reliable than the 32CI models of the early 80s….