Get a long screw driver or length of rubber hose and use it to listen to the engine.
Press the tip against the valve cover and your ear to the other end then work your way across the heads. You should be able to tell if the ticking is coming from the valves by doing this and find out which cylinder it is. Probably won't be able to tell which valve though since they are so close together.
If the sound sounds like it is coming from deeper down and towards the passenger side it might be something in the timing chain rattling.
1989 LE Bonne 122,000 miles
Custom Open Element filter system, Strut Tower Brace from 2nd gen bonne
Light Up Pontiac symbol in grill, 16 wheels from newer Bonne/G, performance tires, performance ignition system, Upgraded brakes.