[Scott H]

I owned a retail Mustang parts store and restoration business for a number of years. Of all the customers who walked in the door not a single one ever said they were happy they sold mom's old mustang or dad's old mustang.
On the other hand, time after time I heard "I wish I still had that car"

Guilty of it myself, I was restoring a 65 coupe for myself. Daughter's boyfriend was visiting the shop and saw it in the paint booth. Fell in love with it and I agreed to sell it to him after I finished it. I never really got a chance to drive it. I made him agree I had first right of refusal. About 10 years later he wanted to sell and I bought it back at our previously agreed deal of "if I buy it back I pay the same as you paid".
Wonderful little car, was still in great condition. I took it to shows, cruise nights, and around town. Kept it for a year and had my fun with it and finally I could say I was satisfied and sold it.

Keep the 66 convertible, at least for year to allow you to get it out of your system before you sell it.