Based on my call sign you can see I like this year Camaro. Regarding value based on the condition you described I would say between $1,500 and $3,000. Decent driver cars which are #'s matching are going for close to $10k and really nice low-milage cars $15k or more.
That is great that you found the car. You rarely see these cars at shows, I feel they are unique and worthy of saving.
I had a friend in HS who had a black on black 77 Z28 and it was a beautiful car, great color combo.
Best of luck with possible purchase.
Todd