Am I Being Unreasonable? Original Owner Wants Car Back

It’s your car so you can set the price you’re willing to let it go for. Sometimes sentimental value helps increase the price to a »I don’t want to sell it price » and that’s ok since it’s your car!

Help educate me through; what is market price of a ’71 340 Demon (tribute)? What is the price of a ‘71 340 Demon (tribute) with sweat equity and sentimental value?