Rule #1 muscle cars will always be lusted for. Mans need for speed will never die. And this means at all levels of the spectrum from pro classes of every racing venue you can think of to all the ratty street warriors racing from stop light to stop light.
Rule #2 never sell any performance cars or parts. Will them to your loved ones with the explicit understanding of their place in culture, their personal worth and the space in time they have occupied and why they will continue to occupy.