I hear a metalic click in the clutch when it is about at 3/4 engagement. What causes this?

 

Could be a number of things from a broken/binding spring in the clutch pack , to a sticking cable. Check your primary fluids and see if it is to the right heigth at the lower edge of the clutch basket. Maybe operate the clutch with the derby cover off and see if you can see anything binding in the clutch (engine off)