I remember that series well. Some of the kits resurfaced in the late 1990s after Monogram and Revell merged. I built the Shelby Cobra in 1997 (great kit, excellent fit) when I was recuperating from a car accident (not in a Cobra). I acquired the 1964 1/2 Mustang and the 1956 Corvette (the Corvette had working headlights and taillights, along with a supplied scale base) but lost them in a bad divorce before I started on either of them.
I still have the Cobra, and I'm looking to add common scale autos for recapturing my youth.