Re: Clinton Engines K-350A
I think Your best bet is to watch ebay.Clinton has been gone since about 1980.There used to be a phone number floating around.I've long since lost it.
I use aftermarket manuals (9)for reference,dates,model numbers,repairs.
Some areas are skimpy but basics are usually covered fairly well.
Unless you really love this motor I would get it running good for as little as possible,and sell it.
Put the money toward a Evinrude/Johnson 3,4,5,5.5,or6 from 52 to the 70s.
easy top work on,routine parts available from dozens of vendors including iboats well established BRP dealers and NAPA auto parts.Reasonably quiet,reliable,,smooth,and more powerful than the Clinton.