Researched a little on one of inventors:

CAPT. LIONEL WOOLSON
Designer of the Packard Diesel Engine

http://earlyaviators.com/pimage24.htm

Early Packard Fuel Injection patent, filed 1923.

Link to other early Packard Patents:

https://patents.google.com/?q=cylinders&q=exhaust&q=engine&q=manifold&q=air&assignee=Packard+Motor+Car+Co&before=priority:19290912&scholar&page=1

Lee Chadwick also filed, in 1916!

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If you don't have success with Bruce, PM me with the all dimensions and thickness of the spacer. I've had ones made for other makes using water jet cutting.

Made out of, Garolite sheet, cotton fabric reinforcement (phenolic / bakelite, available thickness 1/8, 1/4. 1/2, 3/4, and 1".

Color: Black
Max. Temperature: 235? F
Tensile Strength: 6,000-10,000 psi (Good)
Impact Strength: 1.4-1.7 ft.-lbs./in. (Poor)
Hardness: Rockwell M90 (Hard)

One additional source:

http://www.driveshaftspecialist.com/Left-Column/Antique-Classics.html

The trunions are heat treated but not fully hardened. Fully hard is 50-62 HRC, the trunions are probably around 38 to 45 HRC. Heat treating makes them tough but not brittle, fully hard they would be brittle.

They can be bored out using carbide tooling, CBN, or you could have them wire cut, EDM machined to accept bushings. Just be careful not to remove to much material to weaken them.

Another option would be to have the pin portion metal (thermal) sprayed and ground. The trunion bores would be machined first to clean them up and establish the size the pins would later be ground to.

Jig grinding the trunion bores would be one option if you went the metal spray route.

Info about the metal (thermal) spray process:

https://www.ust.com.au/thermal-spray.html

https://www.thermalspray.com/applications/repair-and-dimensional-restoration/

http://www.empire-cat.com/Service/Precision_Machining/Thermal_Spray.aspx

https://vacaero.com/information-resources/vac-aero-training/649-using-thermal-spray-for-repair-of-service-damaged-parts.html

Gear Vendors is a quiet reliable unit, and torque tube applications have been done.

https://www.gearvendors.com/restorationclassic.html

Post showing installation on a '32:

https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=13117&forum=1&post_id=145259#forumpost145259

Nice experiment!

Hot copper will act as a catalyst and oxidize ethanol. Slower process at lower temps?

https://chemdemos.uoregon.edu/demos/Le-Chateliers-Principle-Copper-Ion

Good list of body styles / descriptions, courtesy of the CCCA.

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https://worcester.craigslist.org/cto/d/cherry-valley-1929-packard-super-8/6799284169.html

This is the Bohaty / Carlson service car. Once emblazoned on the bed sides with Pontiac logo and used to its intent liberally. This truly belongs with a discerning buyer who has an appreciation for history fine automobiles trucks and has a devious sense of humor. Roll onto the field at The Greenwich Concours as is or with your Packard in tow. Originating on Long Island, this 1929 Packard 645 Super 8 Rollston or Holbrook custom bodied limousine was converted into a wrecker with manual crank Manley boom . Has been sitting dormant indoors for 50 years. Does not run or drive. Driveline intact. Available for inspection weekends and by appointment weekdays. Interested parties are deeply encouraged to come view this rather rare piece or enact an agent to do so for you. Sold with dealers bill of sale very near the vicinity of the asking price

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Late 30's early 40's vintage.

https://newyork.craigslist.org/wch/bik/d/packard-1940s-ladies-bike-26-tand-model/6803019973.html

https://thecabe.com/forum/threads/packard-bike.120699/

http://www.nostalgic.net/bicycle335