Sounds like a fun trip but to bad you had to nurse the old girl home.
Chrysler made some interesting manifolds for the marine engines, the water cooled exhaust manifolds are pretty common with these.
Here is a link to some photos of a marine Slant Six. Notice how the water cooled the exhaust but heated the intake on this set-up.
http://www.dutra.org/pictures/engine/marine-sl6/leftside-marine.jpg www.slantsix.org DD
