The LT1 style uses a mechanical throwout bearing, and the LS1 style uses a hydraulic throwout.
I've always heard that the starter interferes with the mechanical linkage on Pontiacs, but I've got no experience with that myself. It may be possible to build your way around that...???
There are a couple different bellhousings you can buy that adapt the T56 to a BOP. McLeod's modular one is SFI approved and quite versitle, but costs about $500. Someone casts one out of aluminum, but I can't remember the name... Keisler has complete bolt in kits that supposedly fit your Firebird. Those are a few places to look, anyway. Good luck!
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