This car all depends on rust. It looks complete, right down to the 13 inch rims with correct Corsa caps. If it has the steering wheel and telescopic option, that is probably worth a lot as they fit on Corvettes I believe. I don't think there are too many Corsa convertibles lying around in decent shape and complete for $2000.
The cheapest Corvair will be one gone over by a devotee though. You can probably buy an insanely good Corvair for about $8000. Corvair enthusiasts sell their work cheap and often go to incredible lengths to make them perfect. All the parts you need are available through one incredible business called Clarke's Corvair parts in Shelburne, Mass.
http://www.corvair.com/user-cgi/main
In my opinion the 4 carb Corsa is by far the one to get. The Turbos have a lag whereas the 140's have great mid range throttle response. The 4 carbs are set and forget simple.
The engine is more like working on a motorcycle with lots of sheet metal. I find the cornering very good, but on centre feel is vague (at least on mine ) at highway speeds.
I find the brakes quite powerful for a drum system. (It had full size Chevy brakes in the front and back)
When setup for the track these cars are giant killers, but it is pricey to get them that way. I'd say they can take on a 911 of the era. I am astounded they are still so cheap when everything else that is neat and has handling potential is now shooting up in price. My 66 500' with Corsa running gear is probably worth less than this, but I have owned it for 33 years. Sadly, it lives outside and has seen many winters now.
You could make a facsimile of this car pretty cheaply
https://www.youtube.com/watch?v=eTGayn3Y800