It's probably one or both of:
1. Bushing between the "knob" on the pivot arm and the clutch pushrod eyelet. Two options:
a. "Heim" joint to replace the eyelet - Go to eBay and search "Ford clutch heim joint". A bit expensive and you have to remove the hydraulics and cut the eyelet off the pushrod.
b. Drill stop collar on the "knob", to keep the kob in place on the eyelet.
2. That pivot arm may need some adjustment. If you disconnect it from the eyelet, you can remove the nut that holds it onto the pivot shaft, then take note of its position, then pry it off the shaft (the shaft is splined) and put it back on a few degrees counter-clockwise. This puts the knob a little closer to the firewall when the pedal is in the full up position.