Have you had the brake pads replaced? Does it not clunk when you have your foot on the brake?
In my 91 Camaro, I had a "clunk" in the front end. I replaced everything steering related, and still there was a clunk. Then I realized that there was no clunk when I was braking, even if the road was bumpy. I was thinking about the problem as being associated with driving rather than not being associated with stopping. Upon inspection I noticed the brake pads didn't sit quite perfectly. I pulled them off and bent in the tabs just enough that they were tight to the calipers (and silicone the contacts). I have since come to learn that most mechanics do not adjust the tabs, and so once the silicone wears away they clunk like hell except when you are braking. I too replaced the whole front end before realizing that it could have been a free fix. I hope this helps.
that must be a common 3rd gen issue, my 92 did the same thing.
-Jeff 98 GTP Black 4dr - fully loaded - short ram intake, tinted tails, hole in resonator. sold 98 camaro ss - 6spd fully loaded - cam, intake, exhaust, ford 9in rear 4.11s, 6point chromoly cage, tnt 150shot nitrous, nittos, etc.