The rarer 3rd gens (IE Formula 350, GTA Etc) are scoring some big prices now (even if their owner is an idiot). My father just got offered $8500 for his GTA with no engine in it and it could use a paint job. The original engine just went back in so he can probably get $10K+ for it if he decides to sell. Biggest thing is having a clean straight body and not having the interior shitted up.
GTA Pics