I don't mean to #### in your cheereo's, but if the motor is from a similar vehicle of the same make or newer, it is legal in california. Most smog ref's are not datsun expert's either. so if the motor plate staes it has twin carb's, and the tech see's two carb's with vacuum lines running to the correct places, Air box with correct PCV sytem, Egr in working order, a cat and working exhaust, ect.. who is he to say it's not correct. I am not planning on making every thing chromed out and pretty, I am going to make it LOOK factory. So if it looks like a duck, quacks like a duck, and smells like a duck... it just might be a Datsun.