have heard them that noisy after the heads have been cut. were the heads cut if so how much? may need a push rod length checker to narrow it down. pull a valve cover and a rocker or 2. make sure the contact patch is in the center of the valve tip. if need be use some marking compound to verify.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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