I have always thought that eBay is a good gauge of what a car can, and will bring on the open market. People here, and me too I admit, think you are asking too much for your car. List it on eBay, with your 50 grand as a reserve, and see what happens. the top bid will be an illustration of what the general public thinks your car should sell for.
Would I like to buy your car? Hell yes! I would LOVE to have a '65 4-speed car. But I've seen a few 4-speed Ls for less than what you're asking. That speaks volumes, sorry.