[8D]My MKIV is a 1986. When I bought the car in 2/05 from the original owner, the car had 634 original miles. The 302 engine had been removed modified and re-installed with a output of 350hp. This is a carb engine and the modification was very attractive in appearance. I paid quiet bit for my car but think it is worth the price. I think there are two for sale around 100K. Hopefully this is were the cars are going. Considering the quality and rarity, what you and the seller feel is fair, is fair.
This applies to the US market. I am told that the cars trade higher in Europe.