As said you should have mechanical linkage and can be adjusted.
But before you do any adjusting check the linkage over really good.
If you look at what Gary posted there should be bushings as part of the linkage.
2 big bushings are at either end of the cross shaft or Z bar that goes between the frame and motor / trans.
This can have a big effect on how the clutch works.
Then check where the rod that goes from the pedal arm under the dash, through the floor and connects to the cross shaft.
Again there should be thin bushings but more important that the rod & holes are still round and not egg shape.
Almost fixed
Other than the cross shaft thatI installed new bushings I mde the rest with out themand keep an eye for wear.
Dave ----