Another orientation I heard from some engineering types back in the '70s was that it was offset to the right so that the weight of the power steering gear did not upset the side to side weight balance as it would on "normal" cars.
Another orientation might be the intersecting angles of the transmission output shaft and the driveshaft such that driveline vibrations might have been damped better with that slight angle.
Of course, the access to the steering gear is better with the offset anyway, for whatever reason that made it happen that way.
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