I don't have any experience with the 194.
How big of can of worms do you want to open? Easiest engine replacement would be to replace the 216 with another 216. You will have some issues if you install anything else; there are many threads on this site where you can read about these issues. Ed pointed out an issue in his post above.
I have a lot of sales resistance and I get spooked when I find out someone is trying to sell me something that it's not advertised to be. Could be an honest mistake, but I worry that there may be other mistakes too.
