and fix if needed. O2's easier to service if they test defective. Inspect the drive shaft universal joints and the center suport bearing replace if needed. The stock 2 piece DS does not allow the universal joints to be replaced. Replace the tranny rear isolater mount they sag with age. Inspect the slave cylindere for leaks and fix if needed.
Verify the clutch part numbers from your jobber. Are you doing a stock clutch?
Also replace the piolet bushing and throwout bearing and inspect the flywheel and surface if needed. Make sure all surfaces that the clutch contacts are clean.