4 speed swap

Make sure you have the correct bellhousing ball stud for the Z bar. I had a 67-72 ball stud on a later bell. I had a HARD time pushing/shifting with the wrong stud in. it put the Z bar way out of line. With the correct stud, made the pedal pressure half as hard.
Buy a new clutch kit. Do not waste your time trying to use the old one, even rebuilt.