[Formulajones]

Their literature is a little misleading. There is really nothing metal to metal in the factory clutch linkage, except where the lower rod pushes on the clutch fork, and I see no solution for that, even in this kit.

On the factory stuff, the pivot for the clutch pedal and rod to the top of the Z bar as well as the lower part of the Zbar for the short rod should have bushings with the same clevis or clips used on the shift linkage, so it's all bushed and lubricated. Could even take those plastic bushings out and go bronze for more positive clutch action if you wanted.
Even most of the factory Z-bars have a provision for a grease fitting, just remove the little factory red plug that GM put in many of them and screw in your zerk fitting. And if you don't like the Z bar on the ball stud deal, there are Z bars out there on roller bearings if you want to get fancy.