No, just the right person hasn't come along with the right answer. I personally don't know the answer. Folks get discouraged when a question sits a while. I understand, but you are also looking for an answer, most folks don't have all the answers.
For a more specific forum, you might try Marlinowners.com. They have a collectors section as well as a 336 section, surely those guys know. Heck, there's even a few Marlin employees there, Tomray is one, he may be able to tell you what you need to know.
Larry