Installed new dual friction center force clutch clutch pedal is now very soft and doesn’t come back

Missing info

Car year and model ?
What year bellhousing ?
What year pivot bracket (z-bar) at bellhousing ?
What z-bar ?
What length clutch fork, 12 1/2 or 10 7/8, correct pivot for the fork that you are using.
Clutch rod length ?
Headers? What brand? Correct z-bar for headers?
Return spring for clutch fork?
What starter are you using?
Pictures?
All of these things matter, just went through this.