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In 1969, emission controls were standard in all 50 States per the CRG information below:

https://www.camaros.org/emissions.shtml

John - Jerry MacNeish's 1969 Camaro Fact Book has information on the broadcast sheet codes according to the website below:

https://www.z28camaro.com/publications/

In 1969, GM was still building vehicles at the Fremont and South Gate assembly plants, so engines were being shipped from the Tonowanda engine plant and also sent to Van Nuys.

Van Nuys started using the just-in-time (JIT) inventory system when producing the 3rd generation Camaro/Firebird.  Due to the initial high demand, the plant was producing vehicles on two nine hour shifts daily.  As part of the JIT system, critical item reports were produced each day and due to the additional computer programs, we only had a 1 1/2 hour window to complete all of our processing.  The actual production report was transmitted using a phone modem.  The first thing I would ask each morning was whether the production report was sent to Corporate as the executive committee reviewed GM daily vehicle production as part of their set agenda.

I remember when GM had to charter a 747 freighter to send engines from Michigan to Van Nuys as it was determined it was cheaper to pay the shipping charges rather than stop the assembly line.  After a year, the divisions were still debating who was going to pay for the shipping charges!

I could only find one posting for tag # 3924704:

https://www.chevelles.com/threads/help-decoding-trans.60068/

When I started working at the Van Nuys Plant in 1978, I was told that it cost $400 per vehicle more to produce a car when compared to the Norwood Plant due to the cost of shipping parts to the West Coast.  Most of the parts were shipped by rail in box cars, although the front sub-frames manufactured by Checker Motors wtere stacked on open rail cars.  Whenever possible, GM would buy parts from local suppliers and the one that I remember was Western Wheel.  While the time to transport engines from Flint, MI to Norwood, OH would be shorter than shipping them to Van Nuys, CA, the time difference would be measured in a few days.  We closely watched our transportation charges and our Material Department would often challenge premium freight charges if it was the supplier's fault due to their production problems.  Even though the Van Nuys Plant was over 100 acres, there wasn't a lot of storage, so most components arrived close to the scheduled vehicle production date.  I remember having to go out and inventory critical items at 4:30 am (the Van Nuys 1st shift started at 6.12 am) and fortunately only had to do this a couple of times. 

Previous CRG discussion on Muncie transmission tags:

https://www.camaros.org/forum/index.php?topic=15146.15

I have the March 1969 issue of Road & Track where they tested a 427 Corvette and there is a photo showing the engine from the passenger side and the sticker on the valve cover looks just like the photo posted on CRG for a 1968 Camaro BB:

https://www.camaros.org/engine.shtml#bbcover

I found a photo of #76 taken at the 1969 Kent 300 on page 159 of Dave Friedman's book, Trans-Am The Pony Cars Wars 1966-1972.  Chamberlain's Z28 has an unpainted hood in the photo and is leading Porsche #32, which was driven by Peter Gregg.  I'm impressed with your 1/18 scale model of #76, which was built at the Van Nuys Plant where I was once worked.

When I bought my 1970 Mustang, a previous owner had removed all of the parking brake parts except the cable.  The shock plates on my Mustang are labeled for the right & left side.  Even the levers in the brake drums were missing, but I was able to buy them on eBay, along with the parking brake pedal assembly.  I had to have the Mustang inspected when I registered it and didn't want it to fail if they found I didn't have a parking brake.  As my car has staggered rear shocks, you couldn't install them with the wrong plates and I imagine the same is true with your 1969 Camaro if the shock plates are original.

I found a posting on another website and there was a photo of the metal dash for a 1969 Camaro with A/C and opening had two holes on the top for securing the center air vent.  Are the photos you posted have the vent in front of the metal dash covering the holes?

https://www.pro-touring.com/threads/140639-69-camaro-Center-AC-vent-question

Found a recent sale for 124379N507156:

https://www.bismanonline.com/webster_sd/1969_chevrolet_camaro_z_28_7

There have been a couple of postings in 2024 about COPO 9511 on the Yenko website, but with no new information on how many 1969 Camaros were built with 4.56 & 4.88 axles:

https://www.yenko.net/forum/showthread.php?t=114303&page=6

According to CRG, only 14,899 1967 Camaros had the J52 front disc brake option:

http://www.camaros.org/metallic.shtml