Pedal height is the distance between the floor of the car and the top of the clutch pedal pad. It should be 6.3-6.6 inches (160-167mm) and 6.06-6.46 inches (153-164mm) on later models. To adjust it, loosen the locknut on the stopper at the top of the clutch pedal and then turn the adjusting nut until the pedal height is within specifications. After adjusting the height, always tighten the locknut again.
See Figure 1
Clutch pedal free-play is the distance that the pedal travels from the rest position until the beginning of clutch resistance can just be felt. It should be 1.00-1.75 inches (25-44mm) on 1971-77 models, 0.2-0.6 inches (5-15mm) on 1978-79 models, 0.51-0.91 inches (12-23mm) on 1980-81 models and 0.20-0.59 inches (5-14mm) on 1982-85 models. To adjust, loosen the locknut on the master cylinder pushrod and turn the adjusting nut until the proper free-play is achieved. Don't forget to retighten the locknut.