When installing a clutch kit, especially for 'Northern' vehicles, I recommend to check the pivot ball pivot spring and fork. Our kits always include them. If they aren't needed you can return about $50 worth of parts. No restock fee.
Sometimes the pivot point on the clutch fork is not obvious that it is worn. The whole piece is formed from a metal stamping of what is about 6 ga steel. The thickness of the depression for the pivot is about .192" or about 3/16". It's hard to measure, so I recommend dropping a steel ball bearing into the cup of the pivot, measure from the outside of the fork to the outside of the bearing. I use a bearing out of a destroyed ALH front wheel bearing for example. Delete the diameter of the bearing and you have what is left of the thickness of the pivot in the fork.
I've measured some that appeared to be fine, but the thickness of the metal was down to less than .100" or approachin 1/16" for what originally was 3/16"! It's not that you can't reuse a clutch fork, but nobody wants to do that job and have the rear main seal start leaking in 10,000 miles, or like the picture above, see the pivot ball (which probably was also worn out...), cause you another approximate 6 hrs of labor to repair, or even worse, have to replace the pressure plate.
'Do It Once and Do It Right' is our mantra for 'standard operating procedure'.