Clutch Pedal Not Returning Completely

Have you considered a service manual?
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If the pedal "pops" back up to the stop when you lift it you likely still have an over center spring which would lead one to believe a three finger clutch cover is in there. Normally that spring is removed for the diaphragm style I do believe.
E-brake the car. Have a helper work the pedal through the full motion as you watch for any free play or loss motion in the linkage. Everything should move at the same time. If it's tight and the fork pivots forward and back without twisting, try adjusting the rod nut to make it longer. Use some caution as going too far too quick can bottom the undersides of the cover fingers on a B&B three finger style as you floor the pedal.