The last thing I checked was the rod coming off of the pedal assembly and the pedal return spring. The rod looks like it is coming out at a angle and the clutch return spring on the pedal assembly wont tension when the pedal is pushed.
Are you absolutely sure you have the correct pedal asm./pedal to bellcrank actuating rod and/or bellcrank? It sounds as if there is incorrect actuation of the bellcrank (due to incorrect/bent/out of alignment linkage) not allowing full release of the pressure plate.
Did the clutch asm. come with installation instructions? It used to be on GM applications that used these as stock (diaphram), whereas FORD used LONG or BORG-BECK style (finger actuated plate) that once installed, proper adjustment could only be made with an air gap measurement made between the disc and plate while fully depressed. If the linkage is not allowing full release, the pedal will hang on the floor or near to it.
Also heed the previous advice about a turned down flywheel. There are shims available to bring it back into the correct relationship with the clutch asm. The other poster that recommended reinforcing and gusseting linkage parts also has a good idea, especially on a race car. Have you checked the availability of a clutch cable conversion? It will rid you of all slop.