usually they don't go bad if its been taken care of.
since its off spin it upside down and take a look at the insides, if they have some oil in there its not a huge deal since intake manifolds get some oil in there anyway
id clean it all out with some non chlorinated brake clean, purchase new pulleys and a new belt and your good to go
you should be able to purchase the necessary parts from supercharger.com
I would google that address to make sure
"smoke me a kipper ill be back before breakfast" - ace rimmer