<VV> HELP clutch won't engage

[testkamas at dslextreme.com]

Problem:  will not engage the transmission.... I.E. engine will not drive
the van.


Help!  I am helping mu nephew with his new to him 1963 corvair van.  It
will not engage the engine to the wheels.  It is a 110 with a 4speed sag.
transmission.  When I push on the clutch I can feel the fingers of the
pressure plate being engaged and released.   When I let up on the clutch
there is slack in the cable at the bell housing,  but the van will not
move.  When I move the stick shift I can feel the transmission go into
gear.  There are no strange noises being made like a stripped gear or a
broken clutch.  I am stumped.

So my question is what to check now?  I have checked:
1) Clutch cable.  It has slack.
2) transmission goes into gear.
3) engine runs... never slows when clutch is released.

Help
Chuck