Great model boat, but condition is everything. Soft spots on the deck are expensive to fix and quite common. The deck is balsa wood cored. Problem areas are around the windlass, side decks around rails, windshield base and around the hatches.
Not much other specific issues with the boat. Just look for the normal stuff to make sure it all works.
You said is a Sundancer Express Cruiser. There are two different models. I assume it is a Sundancer. The 330 EC is a different boat.
If its a vDrive, I think that water or rot in transom or stringers is very rare. Not sure about the outdrive version since it has the outdrive holes through the transom. If its an I/O model, check the transom for rot.
Arch height is low, so if you like to stand to drive, you better be 5’6” or less. I am 5’11” and can’t stand without bending forward. Not a big deal for me, but extra height would be nice.
Also try the v-berth. Its angled on the 330. They went to a straight layout on the later years. I am OK with the angled, but it means you have to climb over the person to get out. You kind of do with the straight berths too, but more so with the angled. Again, I tried both when I bought and the angle is OK for us.
If the canvas is OEM Sea Ray one positive is that you can buy complete sets from Great Lakes Boat tops (once they start taking orders again - about US$3,500). If the boat has a camper back, its not OEM. A camper back was not offered by Sea Ray on those years 330s (95 to 99).