Tony, your heart will tell you what to do but I think you have already made your decision to sell it. I know you will build something that you will drive the hell out of and enjoy more than the Chevelle. The only reason I'm keeping the Chevelle is because my oldest Son really wants it and it is something I can pass on to him and I'll know he will enjoy.
Also, you said the same thing about the Camaro before you sold it to me and I understand why you would not want to sell the Chevelle as I'm saying the same thing about the Camaro now.
If not having A/C in the Chevelle is the only reason you may not keep it I have attached a solution that I think will work.