Just undo the 6 bolts and lift the cover off.
You will need to line up the shift forks with the matching gears when you put it back together.

The wire coolers are probably faded but the orange wire is for the right signal and the white wire is for the left. These two wires go to wiring harness connectors on the left hand side under the dash. The third wire is black and goes to the "L" terminal on the signal flasher which is under the dash next to the speedometer (unless the flasher has been replaced then you will have to search for it).

The sending unit should have the Packard part number stamped on the underside of the mounting flange. I know that one removed from a Custom 8 had the number stamped

One end of the relay actuating coil is connected to power at the B terminal and the other end of the coil is connected to the horn button from the S terminal where it is grounded to complete the circuit and close the relay points to sound the horn

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Yes

The 7338 pump is for 1940 and later Buick so will not fit a 1939 Packard. The actuating arm will be different.

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I used 3 layers of heavy roofing paper bonded together and cut to length and width to match the original thickness

The Packard dealer in Edmonton was Miller Motors which later became a Chrysler dealer before disappearing in the mid 70's.
They were located at 10019 104 Street and an online search will turn up some period photos.

Henderson's Directory for Edmonton shows information by name and also by street address. It is available online from the Peel Library at University of Alberta.
References for Miller Motors can be found on page 883 for 1951 and page 631 for 1960, the last year available online.

Peel's Prairie Provinces

What makes you so sure that your Patrician was originally sold in Edmonton?
Does it have a Miller Motors badge on the trunk lid?
Ownership in Devon at one time does not necessarily mean that it was sold new in Edmonton.

There is also a slotted tab at the lower rear corner of the fender for a bolt and washer to thread into a captive nut on the body.
The vent tube has a bracket with captive nut that lines up with a hole in the inner fender splash panel for a bolt and washer.
The vent tube is also held in place by sponge rubber lined bands at either end.

The trunk floor was covered by a very thin carpet material with a flock appearing finish