I have a similar story. When my Dad bought the z, I was 16 - just one year from being legal to drive in NJ. He traded in a 1966 Mustang coup, which I recall he got $500 for at the time. It wasn't anything special - 3 speed with a straight six, but I begged him to keep it for me. Well, that didn't happen. However, I came to love the z. I learned to drive a stick in it and my Dad let me drive it as often as I wanted it. In fact, it was my get away car from the church when I got married.
I'm truly conflicted about selling. Having a decent place to store it is my main problem.