[Coloradocobra]

Not sure from your description but it almost sounds like you are pushing your pressure plate too far. Try to put your car on a slight incline. With the engine off, put it in gear and make sure the clutch is fully released. Slowly press the pedal until the car starts to roll. The desired full release of the clutch should only be slightly below this point. Now start the car and push the pedal to this point and see if the noise is present. If this seems to work, install a stop on the clutch pedal or adjust your linkage to limit travel.

Alternatively, you can lift the back of the car so both wheels are off the ground. Try to rotate the wheels as someone else pushes the clutch down...

Other possibilities include an incorrect throwout bearing that is too large for the transmission nose, an incorrect pilot bearing (too large diameter), or pilot bearing damged during transmission installation.