On the subject of DSII mast flotation, my 1980 has what sounds like the same stuff Talbot referred to. It's square in cross-section, and is a different foam than that used in pool noodles. I found it while replacing the base casting. It won't budge when I pull or push on it, which may be because it runs the length of the mast.
On the subject of bilge flotation, I just discovered a bilge flotation tank, different from the bow tank. It's mounted in the bilge forward of the mast. I've owned my boat for eight years, and I had no idea it was in there.
You can see the aft wall of it in this photo:
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Here's a better photo, borrowed from
jeadstx's gallery. At the right top, you can just see what looks like a piece of flotation foam. There's a similar photo in jdoorly's gallery, so we've got at least three DSIIs that have the tank.
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And here's what it looks like from the front. I got this photo by lowering a camera into the bow flotation tank through an eight-inch inspection port installed in the forward cuddy bulkhead. There are gaps at the top (arrows) and it doesn't look like it was ever attached to the cuddy floor.
So, I suppose I should put an inspection port in the cuddy floor above the tank and pull out the flotation foam to see if it's still dry after all these years.