I can't help you with U.S. import/smog questions but would be interesting to figure out exactly which LC you're talking about. I lived in RSA in the late 80's & early 90's and Hiluxes were everywhere but actual Land Cruisers we not really common at all, surprisingly.
Import taxes were very high and while there was a fairly good selection of locally assembled Toyotas, VW's and Mercedes cars- among others- anything out of the ordinary came at a fairly steep price.
I'm also familiar with the ADE corp.. Never heard about any kind of local assembly of Land Cruisers, with or without the ADE motor.