on my 69 c10 there is a solid rod from the clutch pedal to the bellcrank than an adjustable rod between it an the clutchfork.
do you have this arrangement



not a good photo but the solid rod is not in place at the moment- it comes out of the rubber grommet and onto the bellcrank which is between the mtr an chassis.
if you have this arrangement then you may have left the cast iron piece off the end of the bottom adjusting rod- its about an inch long an fits between the rodend an the clutchfork.
can you post some pics of underneath?

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