My thanks to everybody for their feedback.

I'll add that I found a brief reference a couple days ago to the 373 vs. 381 conundrum in one of the NACO Series Training Handbook sections:

I'll update our funnel's NACO documentation to note the (current) use of the 373 for corporate body names used as "Other Distinguishing..." for title and name-title authority records.

Mark K. Ehlert                 Minitex
Coordinator                    University of Minnesota
Digitization, Cataloging &     15 Andersen Library
  Metadata Education (DCME)    222 21st Avenue South
Phone: 612-624-0805            Minneapolis, MN 55455-0439

  "Experience is by industry achieved // And perfected by
the swift course of time." -- Shakespeare, "Two Gentlemen
of Verona," Act I, scene iii