1971 = change to wet clutch.
Save you a job Kev.
This is from a Clymer manual.
1970 and earlier clutch spring tension
Tighten each nut on the spring adjusters 1/2 turn at a time untill inner surface of clutch releasing plate is 3/16" from outer surface of each spring cup flange.
When increasing spring tension,take care that the foregoing dimension is not decreased to less than 7/64",or clutch will not release.
Is the clutch release mechanism set up ok ?
Chill