Yeah Pro trac's!
I remember those, 16 years old first car was a 2nd generation Camaro I got from my sister which wasn’t running. By the end of that winter it had a 350, Muncie 4speed, 4:11 gears and a positrac. Typical cam, used manifold, shop class port job on some 2.02 fuellies, some 11:1 pop...