Clutch issue

RAT ROD AL said
..This 4spd setup was untested to me as I got it in a package deal basket case cuda project.

If everything in the linkage is tight, the PP is correct and the finger height is set correctly you may have mismatched components. Possibly the wrong fork or a short pivot.
Seems a lot of people have problems with these 3 finger PPs made these days.

yellow rose said
I'm not sure that an OC spring works in both directions.

I believe it's the only thing that holds the pedal up to the stop in a stock application. Without linkage attached the pedal will be either on the floor or up to the stop.