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To replace the injectors on an L98 you need to remove the TB, planum, runners and fuel rail.
If it's the first time in there I would just get a FelPro intake gasket set from AutoZone for around $35, which would contain all the gaskets needed plus the two for the intake base.
I've been into my intake system so frequently in the past four years that I just reused all my old gaskets when I installed injectors a copla weeks ago, with no vacuum leaks.