What is a reasonable price for a 65 Valiant convertible?

Hello. I have an opportunity to upgrade my slant 6 manual everything to a 273 AT, PS. PB 65 convertible. Before I can get the upgraded car, I need to sell my old one. I have the price set at something less then what I have invested but is still too high. Please look at the ad and give me your opinion what what I should price this car at to get it sold. Thanks!

For Sale: 1965 Plymouth Valiant in Dripping Springs, Texas

I hope this is the correct forum to ask this question. If not, let me know which forum is the correct forum to ask in.