I sold new and used Fountains for those years you mentioned.
The Lightning was a more popular model because you do not have to step over the windshield or faring to get to the foredeck. Many Fever windshields have been damaged by people falling on them. Some early Fevers had fuel tank failures, so make sure your surveyor has a good sense of smell. Fountains are very fast boats and with the stepped hulls are not as forgiving as the earlier non-step hulls. Learn how to trim your Fountain, or any boat for that matter, properly for the water conditions.
Fountains have a reputation for being wet boats in rough water, but as you gain experience you will learn how to drive around this "weakness".
Many Fountains of the era you mentioned were laid-up in red gelcoat. Most have had their decks repainted with Imron. Fading was a big problem, especially here in South Florida.
Hope this info helps. Good Luck.