I bought a 1990 (3467) two years ago. We love the boat! She needed a little work also, but once it's fixed up thier great, and that's the nice thing about a 20 year old boat. My friend has a 1991 and we continue to find things to improve on. Here is some tips:
1. The show sump is open and smells, small and plugs. Buy, a weather proof tool box that seals(west marine). Mount the hose fittings with the drain on the bottom. Works great, no smell, holds more water. Also install a bigger hose from the show drain to the sump, drains better and the water doesn't stand in the show.
2. The rear drapes maybe sun faded(?) In the closet by the head, is the drape for the sleeping area. It was like new so we used that drape material to make new drapes for the back.I also removed the back teak step board, that you need to step over. That made it nicer stepping inside.
3. The rear bumper storage is nice, but open and collects dirt. There is a place, here in MN that can make you the plaxiglass doors like the newer models have for around $250.
4. My dash was a little sun faded, so Positron Corp. in Id. can make new dash plates. All ingraved, holes cut, carbon fiber look for $275.
I did a bunch more stuff to fix it up, but they make a very nice boat. Very comfortable! Carver made that design from 1988 to 2002. Models: 34, 638, 380.