I've decided to sell my '04 grand prix gtp and get another old Caddy. I used to have an '89 d-body and loved it. This time around I'm thinking about going for something a skosh older... 1968 Deville. Saw one on collectorcartrader for 4k and decided it has to be my next car. Could anyone who owns a Caddy of similar age tell me what goes wrong, what to look for when I'm inspecting the car, and what kind of money I should expect to shell out?