yes, but there have been a few running around CA with legal registration...i know that for a fact, one guy sold one on here.
does that mean there already is crash data floating around out there? I'm sure you could get the motor to pass emissions, just talk with a RI that's close with you.
another option would be having the chassis sent over, then the engine sent over out of the car. Should pass customs because it isn't a full working unit, then when you get them just put it together and register it as a kit car....not 100% sure if that will work or not, but I've heard of it being done.