Greg --
Are the wheels off the ground? Before you hooked up the driveline - the tailshaft was free to 'turn' a bit to engage the gears - now if you have the car on the ground - you've locked up the tailshaft with the driveline.
Also - are you certain that your clutch is releasing? Is it hydraulic? Did you bleed it? Some can be bled and some can't... so check it out. Usually there is a small bleed cap in the pressure line and if you just barely crack that open and pump once or twice - slowly. Got to get the air out of the system.
If you haven't bled the clutch - it might not be releasing - and coupled with the locked up driveline - that COULD be your issue. Just a thought is all.
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