Idle Drop When Clutch Is Disengaged

[Richard Peterson <Rich_and_Kerry@compuserve.com>]

The engine rpm in my '77B drops down about 200 rpm or so when I am idling=

and I disengage the clutch (that is, press the clutch [pedal to the floor=
).
 This seems abnormal to me, but what do the rest of you think?  About the=

only thing I can come up with is a throw-out bearing which requires a LOT=

of torque.  The car has an overdrive (OH NO, NOT THAT SUBJECT AGAIN) on i=
t,
if that makes a difference.

Thanks to all who respond.

Rich P.