When it is time to sell.

I have a 66 Cuda and a 73 Stroked Duster. Love both, could not part with them easily. I had a 81 Mirada, 340, police package, dual exhaust, etc. Liked the car but seldom drove it, and was not inclined to fix it up, although it was driveable, and the A/C worked. Finally let it go. Keep one or two you really like, and focus on them.