Throwout bearing slipped off clutch fork

Dartseller said
Working on a 69 charger 440 a833 that's been off the road for ages.. Had it all together and pushed on the clutch with my hand. Clutch pedal went almost to floor with my hand and I heard a loud noise. Then noticed the clutch fork was way loose to the point that I could pivot it rearward to almost hit the scattershield opening. Took it all apart and saw t.o.b. was hanging off fork by one clip. One clip looked way spread out so I used a vice to squash the clip back down where it's supposed to be. Put it all back together again and pretty much the same thing happened again (noise and clutch fork loose). Haven't taken it apart again yet. Thoughts?

I had the same issues trying to thread the long a833 pilot shaft through the bell housing with the clutch arm and TOB that was mounted to the engine block.
Fixed that by mounting the bell housing with the clutch arm and TOB to the a833 that was mounted in the chassis.
Them aligned the assembled block to the bell housing that was already bolted to the transmission. Used a couple of bolts threaded into the block to assist with the alignment of the a833 shaft to the crank pilot bushing.
For me this worked great and eliminated any chance of knocking the TOB off.