Were would the marking be for setting the timing belt for a 89 Pontiac sunbird 20?

There are markings on the camshaft sprocket and the crankshaft sprocket. When one is lined up with a notch in the rear timing belt cover, the other should be lined up with the 10 degree mark on the front timing belt cover. Note that you will probably have to remove the front right wheel and splash guard to see one set of markings and the front timing belt cover to see the other.