Worn clutch or other problem?

[Bruno Walter]

My problem is the clutch seems to take a while to "hook-up" 
on a quick, high rpm shift from 1st to 2nd.  I haven't 
noticed any slipping at any other time.  I just assumed it 
was time to replace the clutch, but then I was told the 
usual symptom of a worn clutch is slipping under hard 
acceleration in 4th or 5th.

The more I think about it, the more I am inclinded to 
believe that the clutch is slipping because it is releasing 
slowly.  Maybe the mechanism is stiff?  I bought the car a 
few months ago, and it probably had been sitting around for 
a year.  The only driving I've done is to get it home, and 
to go to emissions testing.  

The car in question is an 86 4kq.