If you are unable to engage the transmission after a clutch job, it's possible the clutch disc was installed backwards.  The clutch disc hub is asymmetrical, and one side is deeper than the other.  If the clutch disc is installed backwards, the clutch disc will never be able to engage properly.

Else, please check out our "Unable to Shift Into Gear" page...
FC3S Pro:  Problems, Symptoms - Transmission, Unable to Shift Into Gear

Questions?  Comments?  Send mail to:  reted@fc3spro.com