You should evaluate the condition of the boat -- hull condition (especially scratches, wear on the bottom), condition of the hardware (corrosion), etc. Has it been stored indoors (or at least out of the sun)? Condition is more important than age. The old tandem hulls are efficient; most parts are replaceable. Limitations -- the old seats are riveted and not removable; the kick-up rudder is not expandable or upgradeable. You can upgrade the Drives to Turbos if desired. Access to the interior for patching or repairs is limited. It will not take a Hobie cart or sail. IMO, the price might be a little high (especially this time of year) unless it is in excellent condition or has upgrades / accessories included. He paid about $1800 for the boat 19 or 20 years ago (I bought one the same year). Of course, this also depends on your local market and what alternatives are available.
As to water in the hull, it doesn't seem excessive or problematic. Those old hulls can leak from several points. Rudder cables in the stern are not sealed and the stern tends to squat with speed. That's probably your biggest source of water. Rudder control and up/down handle on the starboard side also are not sealed. It's easy to remove the water with a sponge or rag after using and open the hatches to let the boat air out. Any hatch sealing you might do would probably not mitigate the situatilon. If you want to try anyway, you can reinstall with clear silicon calking would seal the mount. The hatch opening is another matter -- check the gasket. Same with the rear hatch mount -- it tends to collect water from the cargo area.
Good luck with your decision!
