['68OrangeSunshine]

BTW, P/N 21 in RichardJ's diagram is called a ''Pivot Nut'' or ''Nut-Pushrod,'' even though it's not a nut or threaded at all. I had one break apart on me, coming off the freeway on a hot Tucson day. Over-50 year old metal, plus my bad habit of dropping the clutch pedal and jumping on the accellerator in high speed manuevers precipitated the failure...
I had called a tow truck, but in the 2 hours they were expected to get to me, I crawled underneath -- after the headers cooled off -- and extended the lower clutch rod throw by moving the jam-nuts aft a couple inches. Got home OK, and even ran it to work until a fresh pivot nut arrived.

Putting the lower clutch rod and pivot nut in the outer hole does give more leverage.
I also have a '71 GMC Jimmy K/1500 [V8 350/SM465/NP205/12-Bolt Posi, 3.73]. The PO machined threading on the rear tip of the lower clutch rod so after it goes thru the pivot nut and the clutch fork, it's captured by a lock nut. Extreme 4x4 mod, I guess. Never seen another one. But I kept it on.