DONT JUST BEARING SWAP THE CRANK!!! Get it checked for straightness. depending on how you have had it sitting. either laying down flat on the floor or standing up on the crank hub Which is the way its Supposed to be. But even a week of having it sit flat will ruine a crank. SO with that sed Have It Checked for straight and bearing journals. and i always use a Bushing not a bearing on the LT1's. the longer input shaft tends to wobble Just a bit and wear out/blow out the Bearings.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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