You can't change what the law provides, just because you and buyer agreed to do so. Smog is required by seller. Call DMV and check on salvage title requirements.
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Seller must smog in CA UNLESS the vehicle is sold "non op" and it is not clear if it was sold that way here. Regardless, I do not think you need to do a lot of "fixes" unless you promised to do those fixes especially if you were upfront and honest re: the salvage condition of the vehicle.