OK.....
My manual has the following to say about your forks
"apart from their greater travel and different appearance, the Marzocchi forks fitted to these models feature bushes which can be renewed separately to compensate for wear"
Looking at the diagram, there are bushes on the bottom of the dampener rods and at the top of the lower fork legs.
Your bike does have a considerable milage on it, so it would make sense that some work is required to get back to a stock condition. I would gamble that modern, stout(50mm) forks will be stiffer, offer more adjustment, and improve ride quality if set up in a way that does not change the steering geometry much. If you go with a longer travel fork and lower it's height by raising the tubes in the triple clamps, make sure that the tire cannot contact the rest of the bike in any way at maximum compression. Let us know how it goes either way.
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