Are you an Inliner? If so, I did a story with pictures on this Nicson stuff for the May/June 2000 issue of the 12-Port News. Pages 21-22. This was when a friend of mine owned the parts and I was doing some work on them. After owning the parts for over 20 years, he lost interest and I bought all his Nicson stuff. Not easy to find the aluminum heads, I've heard of only a couple others besides mine. I'm sure there are more out there, just hard to find and expensive. Plus these heads only fit the 216 and early 235, not the later 235 due to the headbolt pattern change.
What I would really like to find is an original Sharp short sidecover.(if one was ever made?) If I can find one, I will try to buy it. If I can't buy it, I will copy it and make a reproduction. I would really like an original though, and I have a friend that would like one too. Right 6cylindersovertexas?