So far today:

The old stuff at Mazspeed is lost, or only accessible by a certain few moderators, so no luck there.

Preston has retired from the Volvo dealer, and the guy that works on the older (200, and 700 series) cars is out today.

Edit to add: And it has been raining heavily for over 24 hours here in the Gainesville-Ocala area, so there is no way that I am going to crawl under a car at the junkyard to look at how its bushing is aligned.

But, I did call Continental Imports in Gainesville and spoke to Steve Brotherton. Steve is one of the owners of CI, and has been working with Volvos, Mercedes, and BMWs for a very long time. He said that they have done several of the tailshaft bushings, and that there is no particular way to align the bushing UNLESS THE BUSHING HAS A HOLE IN IT. If there is a hole in the bushing, then the hole should be positioned over the groove for the oil, or the bushing and tailshaft will get no oil.

I met Steve over 30 years ago, and take my car to CI when it needs something done that I can't do. Steve and Richard (Shop Foreman) know their stuff like they were born with car keys and a wrench in their hands, and read parts catalogs and factory repair manuals in kindergarten. CI is the only place I trust to work on my two Volvos.

That said, I'm going to install the bushing so that the hole in the bushing is aligned with the oil groove a 4:00 (looking from the inside of the tailshaft housing out the back end). The grooves are different sizes (width and depth), and the one at 4:00 is deeper and wider. Will also take care that the seam in the bushing is positioned at about 2:00. The bushing can be positioned two ways with the hole aligned with the oil groove, and I think that keeping the seam up higher, and against solid backing is the safest way.

The guys at CI have never let me down, and I have great faith in them. Now, onward and offward to my hydraulic press, then to get Posideon back in service. Will let you all know how it goes. But I'm hoping that it goes so well that there is nothing to post about this fix for years to come.
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1955 Human, Scott; 1991 745 Turbo, Thunderbolt; 1990 745GL, Posideon