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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

Below is a prior posting about the 1967 Kent 300 race on CRG:

http://www.camaros.org/forum/index.php?topic=11290.255

As I believe you are located in Australia, you can have a search performed on the website below to see if there are any records on a particular VIN number:

https://www.ppsr.gov.au/searching/do-used-car-or-vehicle-search

https://www.classic.com/veh/1968-chevrolet-camaro-rs-124378l311635-n8kkl14/

CRG has information about the "special paint" option for the 1968 Camaro:

http://www.camaros.org/numbers.shtml#ExteriorColors:S:SpecialPaint

When my friend bought a 1968 Z28, the original owner didn't like the stripes, so the hood was repainted in body color, which was British Green.  I remember that you could see white paint on the bottom of the inner cowl panel.  Unfortunately, we didn't look at the trim tag and don't have information on the VIN number.  The license was California XCR 771.

I found a photo of a spiral shock from a 1967 Camaro posted on another website:

https://www.camaros.net/threads/spiral-shocks-date-code.206862/#lg=thread-206862&slide=0

During production of the 3rd generation Camaros & Firebirds at the Van Nuys Assembly Plant, the temperature controls in the paint ovens malfunctioned, causing the sealers in approximately 700 cars to melt before the problem was discovered.  As these vehicles could not be sold, some were donated to local schools for auto shop classes.  There was an attempt to remove the engines & transmissions from these completed cars, but it was found to be too costly and the cars were sent to a local salvage yard and crushed.  Plant security was present at the yard as they removed the VIN tags before the cars were crushed. The owner of the salvage yard couldn't stand seeing all those new Carmaros & Firebirds being destroyed and left before the work was completed.  At least the 1972 vehicles at Norwood were assembled and then sold in Canada.

Exhaust bracket could be part number 3953246:

https://www.ebay.com/itm/226696452714

YouTube video on 6 cylinder heat riser operation:

https://www.youtube.com/watch?v=9tepFx1uMJo

GM has a spray that is used to lubricate the heat riser flap:

https://www.amazon.com/Genuine-GM-88862628-Penetrant-Inhibitor/dp/B00BK7MLKE?th=1

You could also try Kroil penetrating oil.  I don't believe you can remove the flap without cutting the shaft.

I still have the tag when Edelbrock Balancing Service Co. balanced the assembly for my Ford 289 engine.  Edelbrock marked the crankshaft "30403" with yellow paint and listed the following information on the tag:

Piston (wpl) - 21 7/8 oz.
Pin - 5 oz.
Rings - 2 1/16 oz.
Inserts - 2 3/4 oz.
Rod 19 1/4 oz.

I found this information about Edelbrock when they were located in El Segundo when I had them balance my engine assembly.

https://www.motortopia.com/culver-city-heroes/

I remember the tire pressure decal on my friend's 1968 Z28 as he hid an aftermarket 8-track player in the glove box and I would change the tapes as we cruised down Van Nuys Blvd. in the early 1970s.  Too bad we don't have the VIN number, but the California license plate was XCR 771.

My 1970 BOSS 302 still has its original Carter X 4910S fuel pump, which was rebuilt.  I find that the gasoline will evaporate from the carburetor if I don't start the engine every couple of weeks.  I know that some will remove the sight plugs and fill the bowls with gasoline.  I'll just let the car sit for a few minutes if it won't start after a number of attempts and usually it will start with one turn of the starter.

I had a 650 cfm Holley 4150 with mechanical secondaries on my 1966 Mustang and never remember having a problem with the float level
Even with a Le Mans camshaft, it would only rev to 7000 rpm, no match for my friend's 1968 Z28!

I've always used the procedure below to set the float level on Holley 4150 carburetors:

https://www.youtube.com/watch?v=ge-mIk6nEYQ

Do you have the same problem adjusting the float level with the Carter M4685 fuel pump?