My take? I like the old cars and their old car ways. The sentimental value of your history with the car is more important to me than the value of selling it. However, if you are bored or tired of it, and there’s a car you REALLY want out there, I think your Dad would agree that a trade or sale to get your dream car would be an acceptable move. That’s what I did, I had my GTX for over 20 years, and although I loved that car, I’ve always wanted a 70 Roadrunner. I decided that the time was right for me to make that happen, and I’m glad I did. I thought I would have sellers remorse, I didn’t. Instead, I have a new found passion for the car that I feel I waited all my life to get. If there’s a car you really want out there, I would consider moving the Dart, but I think in the end, the Dart is probably irreplaceable. It ties you to your Dad, and no other car can replace that!