Hydrolic TO Barring

Have any of you guys out there installed a hydrolic throughout barring before? If so I'd like to know about how far from the clutch fingers do I need to set my shims up on the input shaft. I have a friend (ASE certified mechanic) who has bee helping me with my build, but lately he has been bussy, and I want my truck rolling sooner rather than later. Any help with this is greatly appreciated.