Only smog legal LS swap in Ca is the crate Erod kits from GM performance. The standard production LS engihes from junkyards use enhanced evap systems that can't work with G body gastanks. The erods are special versions with older style evap systems that will work in G bodies. Law is you can't downgrade a engihe's emission system, so you can't use the old style evap on a used engine that originally had enhanced evap.
There's a link to the PDF of the Smogcheck Reference Guide here (see question 3):
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