Looking great! I think your lighter is a little out of scale, though. This could really be any major US inner city, not just LA. Just by changing the police car it could be Detroit, New York, Newark, or just about any place.
That's kind of what I'm leaning toward. I have a photo of a Dodge Bighorn with the hood tipped, and the engine "looks" white, but you really can't trust 1970s color photography sometimes.