Hello,
I have imported a few BMW's, including a '73 3.0csi to CA. However, it has been a few decades.
At that time I used a roll-on roll-off which I would not do today, I use solo transport as has been recommended.
No SMOG issue upon entrance at that time I received a waiver I passed what was BAR predecessor with flying "numbers"; a d'jet would.
However, FMVSS and DOT compliance was a concern prior to reg. and I documented my car to the regulators with pictures of seat belts, window production codes (needed safety glass on windscreen which I had), and Lamps...ultimately getting approval as well.
Having a nice invoice for cost will be helpful if you can get a favorable (2nd)...I paid a little (anyone would have paid what I did) for my car so taxes/fees were not that bad: aprox $700 including transport (1983).
As Tyler points out DMV rules so have documentation in order.
Cheers,
Jon