While I agree that trying to figure out the regs requires a PHD in understanding government documents whoever led you to believe that engines produced prior to the diesel tier regulations cannot be imported was wrong. There is a steady stream of antique engines coming ashore in containers. Anyone who wants to spend what it takes to go that route I can hook them up without people who can get it it done once you find and get an engine bought across the pond. I'm not sure why anyone would do that when for less money they can be found here but to each his own. A $500 Lister CS located in England becomes a very expensive engine by the time its in someone's hands stateside. There is considerable interest in CS Listers among the Amish but they don't see on-line ads. This was the basis of my shop buisiness for years, while people were importing from England and buying Listeroids for $2000 I was buying CS engines from Amish for,, uuuh,, much less than that. If you advertise your CS in one of the several trade papers that circulate with the Amish community you will get responses, assuming someive in your part of the world.