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My car is also LA built (dec 19) JS29N0E 127xxx. Unfortunately no evidence of buildsheet or any factory markings as car had the surface rust on the underbody.



I also have a JS29N0E survivor, with a very nice undercarriage. SPD was Dec 18, and I have searched in futility for a broadcast sheet as well.
One of the more obvious differences I see in LA cars was the use of black dip primer instead of the usual gray.
Here's a link to some detail pics of the markings on the 3.55 rear of this car.
http://rogergibsonautorestoration.com/1970383Challenger_RD.htm