Should you buy, sell, or hold these classic Mopars?

Yesterday a friend asked me which of my cars I liked the most. My answer was simple and honest. What ever one I was driving at the moment. That being said, both of my classics are for sale. They only have small for sale signs in the rear window and are not advertised anywhere. My reason for selling comes down to a friend with a 68 black on black Charger R/T that I could have if I waved the right amount of green under his nose. Neither of my cars are worth enough to get the needed cash but selling both would cover it and then some. The sticking point I have is I won't sell either of my current rides at a loss. I know what I have invested without adding my labor in and that is my bottom line. It seems that every year my cars are worth a little less or just barely holding on in the market. Whenever I change a part or rebuild something the selling point gets more difficult. The market for classics around here is pretty soft and unless someone with an abundance of cash takes a liking to my cars I will enjoy what I have and hope my friend holds on to the Charger a while longer.
Jerry