I know recently a 88 GT with 13,000 miles going for $17K.
The values are starting to show in the high feature 88 models and also in the prime condition models.
It is supply and demand that is working for us if you have a low mileage car or one with absolutely no rust or wear and tear. So many of the cars left have rust or have been rebuilt to the point buyers are not always sure of what they are getting over a stock car that they do know.
Watch for rare options and desirable features to really become important. I expect T tops from Pontiac or the earlier dealer installed tops will both add a premium to the car.
I would say that if you want a low mileage V6 Fiero no matter what they year you had better buy it in the next couple years or you will be priced out.
Restoring one properly will nearly become impossible too as the NOS parts are getting harder to find and more expensive.. This is why I just popped for a set of NOS valve covers.
Based on this information my black 88 T-Top Fiero GT with 33K miles should be worth at least $13,000 in Canada. I would consider $12,000 USD if anyone is looking for a very nice stock CJB T-Top Fiero GT.
I would not say any GT as I have seen a lot of real nasty ones that I would not give you $1000K for because of rust and abuse.
A low mileage car is not all that uncommon with the Fiero as so many people back in the day parked them expecting to get rich. In the last few years we have been seeing more and more of these come out of hiding.
These low mileage cars will always command the top dollar as it will be more and more difficult to resort a Fiero to stock condition. Until Rodney reproduces a lot more parts the lack of NOS parts will be a major issue.
As for 63 Vettes a top split window depending on the options is $75K-100K but a hacked up one can bring a very low price. To restore them back properly can often cost more than even the high value.
Anymore it is better to find a restored car and buy it as too often the guy who had it restored spent a lot more than what you will pay for it. Even doing most of the work just in parts alone most cars can rack up a big price. The key is documentation of the restoration is important. Too many restorations are hack jobs and many get burned.
I think the values will follow other GM odd balls like the Corvair for example. Corvair lovers go crazy for them but they still don't command the higher prices seen by other models unless it's a turbo Spider model or a Yenko.