s14 clutch advice

theres something up with the clutch in my s14,have an orc 409 single plate in it,when releasing the clutch at take off i get a crunching noise,we took out the gearbox + clutch had a look and saw the input shaft bushing was worn so changed it and it was ok for a week or so and the noise came back again.anyone got any ideas on what it could be,was thinking about just putting in a new clutch while iv the gearbox out this time besides taking it in and out againany suggestions on what clutch dont really have the money for an orc this time and it nearly cost the same to rebuild as a new one does.thanks