I found two of the screws missing from around the screen over the top of the carbs, I cannot find them. So I think they dropped thru carb into the engine. Damn shame too, I finally had it running pretty good. Jet pumps and carbs just rebuilt. Won't turn over by hand or starter , with plugs removed...I haven't taken off that plate that the carbs attach to yet to determine the damage. I would love to do it over the winter but my garage is filled with other projects and work repairs to be done. Right now I am building a 302 for my 67 mustang.
Thanks for the link to the manual. What I elected to do because I wasn't sure where to "pinch off" the incoming water line, the manual wasn't very clear. I removed the water lines and used a powerful vacuum and removed bout a gallon of water from them. I do commercial cleaning and own some really great wet/dry vacs.
Just in case the damage isn't too god awful bad, I wanted to winterize it so I at least wouldn't have to deal with a cracked block. I love these old ski's as they are much more squirley is a good word. The newer bigger hulls seem like they are harder to manipulate. Thanks for the replies and everybody have fun with your winter stuff.