I have imported 2 cars from overseas in the last 3 years. One, a 1972 from Italy into Hueneme, and the other a 1970 from the Netherlands into Long Beach (neither are Land Cruisers) I live in Simi Valley. You cannot direct import anything newer than 1968 into California anymore. Diesel or gas, does not matter.
Car can come into a California port, and all paperwork can be done (customs and epa) but can’t be registered here without being registered in another state first. The 1972 car I bought I registered in Oregon, didn’t need to take the car there, just the paperwork and a VIN verification form (the will accept the CA form as long as it’s done by the DMV or a peace officer: no AAA etc.) Oregon is nice because they have antique plates where you only pay a one time registration fee.
The 1970 car, a Citroen, I am just being lazy about. I’ll do the same thing.
As far as smog, yes pre-1976 gets a pass, but that only applies once it’s registered here. 1968 is the year California goes by for the last few years.
Are there people out there who know a guy who knows a guy? Perhaps. But I don’t, so this was the easiest way.