The stuff floating in the hulls is probably from the foam encased in the hulls. My old '81 had the same thing. The pop out hatches always leaked from the rope holes. You can always change them to the screw in type if it makes you more comfortable. I would check and change the more important things first though. Like the rigging and tramp if it needs it. If It still has the all aluminum mast, leave it as is. Unless you're racing, you will derive no benifit except cost.
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<br>If the boat is in as good of shape as you state thats not a bad deal. Note offer lower (you can always go up but not down)
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<br>Just my $.02. Good luck.
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<br>Clayton
<br>H20, H16
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