As a start to rebuilding the gearbox I did the clutch slave cylinder and throwout fork first. As usual, everything was dirty, worn out, and seized.
Notice the wear in in the following picture in the old clevis pin and clutch fork pushrod. These were fixed with new parts. The clevis pin end of the clutch fork was also worn to an oval. This is a 5/16" hole but was badly oval. I drilled it out to 3/8" and then pressed in a 3/8" OD X 5/16" ID bushing, good as new.
Now to tackle the gearbox itself. I am waiting for parts to complete the rebuild.