It should have a timing belt and go to carfax.com other than that if your not sure and you think it should be replaced then have it done anyway. If that is a zero clearance engine and you loose your timing belt you will have to replace the whole engine. Its cheaper in the long run to have the timing belt replaced.
go to auto parts store and buy a Chilton's auto repair manual $20.00 it will tell you when to change the timing belt or chain what ever it is and also how to inspect them to know when to replace them