Clutch movement

[hchad18]

I am installing a M-21 car trans into my 71. I am fabricating the lower linkage because I am using the car clutch fork. My question is how much pedal movement does it actually take to disengage the clutch? I've installed different bucket seats and the clutch pedal is to high so I want to adjust it so its lower (closer to the firewall) but I don't want to not have enough throw to disengage the clutch. My experience is, is that it's not always required to push the clutch pedal all the way to the floor.