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See PM sent with some past history on the 733

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That sounds like the wrecking yard that used to be north of Coeur d'Alene, Idaho. I drove past it many times on the way to and from Spokane.

I don't have a photo readily available of my installation as the car is stored in a location 140 miles away but i took a few shots of an original front carpet. The edges are finished by wrapping the carpet material over the sides and bonding it to the rubber backing.

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The 22nd Series Custom 8's used Mosstred carpet which is a Wilton wool carpet bonded to heavy foam rubber. There is no binding on the original as the carpet material wraps around the edge of the rubber backing. I duplicated this on my car by purchasing the Wilton carpet material from Bill Hirsch and attaching it to 3/8" thick closed cell neoprene with spray on 3M adhesive 90. In hindsight I should perhaps have used open cell neoprene for a closer match to the original but thought that the closed cell would be less likely to hold water in the event that it became wet. I was very careful about fitting up the carpet and backing material before using the spray adhesive which is like contact cement, so once pressed together it is there to stay. The rear carpet is quite easy but the front takes a bit more care as it has a cutout where it goes over the transmission hump that is not sewn but simply butts together.
I have no experience with 23rd Series cars but the parts book shows different numbers for the Custom 8's so it looks like different material was used.

You might try some of the air museums that have WW II aircraft. The RAF museum lists some of the more common models on their website. You would probably need to visit in person or send an inquiry by email to find the more obscure ones however.

I'm not sure if your valve extension kit came with a box but here are the instructions from the back of the box for accessory part # PA-383928:

1-Drill a 5/16" diameter hole in the rear body panel a few inches to the right of the left tail lamp and two or three inches below the bottom edge of the trunk lid.
2-Assemble the connection tightly to the valve on the spare tire and install the hose along the left side of the trunk compartment so it will be clear of luggage.
3-Insert valve core end through the hole in the body with the small nut and lock washer against the inside of the body panel.
4-Assemble the gasket and large retaining nut on the outside surface of the body and tighten securely.
5-Check the tire pressure and then apply valve cap.

Hope this helps.

The vent whistle for 1951 is in the little round cap that is soldered to the top of the gas tank. The whistle was eliminated for 1952 and later with a larger diameter vent tube. See attached pictures.

The gas tank would need to be removed from the car in order to unsolder the vent cap and remove the whistle.

My 22nd Series Custom 8 still has the whistle and as noted by others it does tend to attract attention when filling, especially at the rare locations with full service. It can be quite amusing to note the puzzled or frightened look
from the pump jockey!

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As noted by HH56 the Delco regulator is grounded through the mounting screws to the body sheet metal and does not have a terminal for a ground wire. Where it differs from the Auto Lite regulator is internally as there is a second armature winding in the voltage regulator section that is grounded at one end internally and gets power from the ignition switch via wire #18 to the IGN terminal. The hard wired ground would be redundant for the Delco system but the connection to the ignition switch is necessary for it to function properly.

Unlike earlier models, there is no gasket between the intake and exhaust manifolds at the heatbox.

Also check the bolts that hold the rear brake drums to the axle for tightness. If they become loose it can cause a squeak or clicking noise that is most noticeable at low speeds.