67 Camaro Barn find/what's it's worth????

[benihana]

A buddy and I were in Wisconsin a while back and stumbled across this beauty! I was able to find out who the owner was, but want to know what a fair offer would be, either from me to him/him to me. The last time this was licensed was 1987, so I assume that it has been in hiding for 20+ years. I know nothing about the car other than what is in the pictures.