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This video shows two different theories on adjusting the clutch.
The key is to have the bearing slightly spinning, but not have a lot of load on it until you press the clutch pedal. If you hear a “chirping” sound, turn counter-clockwise until it barely goes away. This will keep the slight preload on the bearing but not burn the bearing up by spinning constantly WITH load on it- which is what you do not want.
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Here are maximum motorsports instructions for the constant contact
Securely attach the firewall adjuster to the firewall.
Assemble the firewall adjuster correctly using the manufacturer's installation instructions. The adjuster mechanism has two parts: the half bolted to the firewall protrudes into the firewall, not out and away from it.
Route the cable so the end of the outer housing seats squarely against the adjuster mechanism.
The transmission end of the clutch cable housing must remain at a right angle to the bell housing. The stock retaining clip, located underneath the clutch fork cover, keeps the cable in the correct position.
Adjusting Clutch Cable Tension
The goal of adjusting the clutch cable is to put enough tension on it to keep the throwout bearing in light contact with the clutch diaphragm fingers, ensuring both proper clutch operation and long clutch life. Do not use the firewall adjuster to customize the pedal height or adjust where in the pedal travel the clutch engages or disengages. (Maximum Motorsports makes Clutch-Pedal Height Adjusters specifically designed to do that job correctly.)

Grasp the cable outer housing with one hand.
Pull it forward: toward the radiator and away from the firewall. This may take some effort. You need to remove all slack from the system, which forces the throwout bearing (by design) up against the pressure plate diaphragm.
If there's no gap between the large, round, flat end of the housing and the front face of the adjuster, thread the adjuster into the firewall until you can see a small gap.
While continuing to pull the outer cable housing away from the firewall, rotate the adjuster to thread it in or out of the firewall until the gap is about the thickness of a dime (0.050").
Confirming the Adjustment

The cable should have just enough tension that the pedal moves down 1/2 in. when you press it with 5-8 lb of force. If the pedal moves more than that, increase the cable tension by screwing the firewall adjuster further out of the firewall. If it takes more than 8 lb of force to move the pedal 1/2 in., decrease the cable tension by screwing the adjuster further into the firewall.
If the clutch won't disengage when you press the pedal to the floor, increase the cable tension by threading the adjuster out of the firewall.
If the throwout bearing chirps when the clutch pedal is depressed and with the engine running, there isn't enough tension on the cable.
Periodic Adjustment

A properly adjusted clutch cable has some tension on it. This keeps the throwout bearing in constant contact with the fingers on the clutch pressure plate diaphragm. That contact is essential for the self-adjusting mechanism to work. Contrary to popular belief, this is a design feature and does not prematurely wear out the Mustang throwout bearing.

The concepts performed in all videos from Danny Johnson are for demonstration purposes only and are not guaranteed in any way as I am not a certified mechanic. The viewer holds the responsibility to research these procedures and perform them at his/her own risk.
Due to factors beyond the control of Danny Johnson, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Danny Johnson assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Danny Johnson recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Danny Johnson, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Danny Johnson. Always take proper safety precautions, including, but not limited to, wearing safety glasses, removing jewelry, properly securing the vehicle on jack stands, etc.