It's all relative, and something is only worth what someone is willing to pay.
I looked up me and my cousins Cuda we bought in the late 70's to work on together. I believe we paid like 1 grand for it and sold it for 4K and we're tickled pink. That car if sold brand new today, would run you $21,000.
I'm still sick of the thought of selling that 440 6 pack because you will NOT be buying one for 21K even if it looks brand new.
Heck, I looked at my old college car, a 1972 Oldsmobile Cutlas Salon tonight just thinking perhaps I could find one at a reasonable price. Good luck Charlie.
Funny thing though... the 440 6 pack is only a couple tenths of second faster 0-60 than my dads Honda (I almost fell over dead when my son gave me his grandfathers cars rated times LOL). Yes, a Honda. I still have no clue why Honda discontinued their V6 coupe. It was my dads third one he bought as he loved it.