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There is Engine World or something like that in Berkeley / Emeryville. They import a lot and I mean A LOT of JDM engines. Try them, pretty good prices and they warranty their engines and transmissions.
one of my customers blew his head gasket so he decided to just go ahead and replace the whole motor instead. I kept the old motor because my bro has a sc300 and his have a lot of problems and it finally threw a rod, so we just fixed the head gasket on the one I had laying around and swapped it in.