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Well that rules out the cam/rockers. 1991 had the chill hardened cam/rockers. But you should check to make sure none of the rocker arms have loose bolts. You can visually inspect the cam with the valve cover off too. When was the oil last changed?
If you have your head in the engine bay, moving the throttle linkage manually, can you pinpoint exactly where the noise is coming from?
How many miles on the car? Ticking is a noise associated purely with the top end of the engine. It could be worn valve guides if you have anywhere near 200K or over....which allows the valve to wander around just a bit causing a ticking noise.
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