Is it possible to tell what camshaft the previous owner put in the head?

 

yes look at the end(side that sits with the distributor) you should see rings on the coller or some sort of marking on the face(part with the slot in it). Why do you think someone put a different cam in the engine. a little info on the car helps also....

 

hope this help!!

http://www.ff-squad.com/tech/temp/VtecCams.htm

 

^^That's only good IF OP has a DOHC engine, not a single.