I took driver's ed in the summer of 72. Our regular car was a new 72 4 door coronet. The only mod I'm aware of was a brake pedal on the passenger side. All of the instructors were our high school teachers. One of the teachers would bring in his 40's Chevy with a 3 on the tree. Everyone had to take a lap around the parking lot. It was a hoot watching some of the kids trying to drive that thing.