I was working on my recent purchase Clinton engine and Googled those. Came up with this site. Seems to be some decent info in there.
Anyway, I bought a Clinton at the tractor show just for the carb. The engine is not turning over so I got it cheap. I needed the carb for my Merry Tiller. I got it off and torn down. not in bad shape considering. I have it soaking in Apple Cider Vinegar to see what that does to it. All interior passages seem to be clean, so I may be able to finally run the engine for more than a few seconds.