Well, as noted we cleaned the floor with water and Henry's multi-floor cleaner. This product is one of the few I've found that specifically lists linoleum as safe. The Eureka - unlike my Cotington 48 and Pinner-Chrysler - has true linoleum as opposed to vinyl sheet. One can tell as the pattern goes all the way through the material. Home Depot has it:
http://www.homedepot.com/p/Henry-32-oz-Multi-Floor-Cleaner-19122/202504363
The black tar-like materials were hardened and quick resistant to whatever we threw at them. Goo Gone/etc. made little dent in what was there. A flooring website suggested the use of Mr. Clean Magic Eraser and solvent. Well - that worked remarkably with a bit of isopropyl alcohol. The "Magic Eraser" is basically a microabrasive foam, and was able to take off the "tar" stains with relatively minimal effort. Quick wipe-up with linoleum cleaner, rinse with water, and done. A little lighter than surrounding where I used the product, but I'm looking forward to a few coats of Armstrong Shinekeeper polish this weekend and suspect the difference will not be noticeable.
One interesting thing - there was a Model 173 setup installed sometime in the 1980s so the Tres Piedras Fire Dept could use their One-Man Cot (either a Model 26 or a Model 28 "Ferno-FLEX). This was of course removed prior to the car being given to Taos County EMS for parade use and summarily stripped of many items. There's a few screw holes in the floor from the missing clamp and "Antlers," and I surely don't plan on putting them back. I pondered buying a linoleum repair kit - which contains putty that you're supposed to guess the color and try to fill holes/tears with it. Lo and behold, a few bits of the "Magic Eraser" got stuck in the holes and I noticed that it peculiarly matched extremely well. The foam absorbed pigment/material from the linoleum as it abraded it - and turned the exact color of the floor. I packed the holes with the used material - and viola. Will see how it holds up with sealer/wax over top - or if it'll need a bit of epoxy. I'm not sure I could've found a better solution than that. If you don't know what you're looking for - it's barely visible. Surprising.
One further mystery may have been solved by Kevin O'Connell - namely, the missing, yet odd three-hole light bracket for the loading spotlight seen at
http://www.professionalcarsociety.org/forums/attachment.php?attachmentid=29387&stc=1&d=1444080784 . It's not any form of Unity product that I have been able to find - all have four holes. However, Kevin suggested it might be a Federal Model 18 SolaRay mount - which he says could accept a Unity spotlight. Hard to find an image on Google - but I did, and it indeed has a triangular screw-pattern that seems to correspond to the missing bracket. Maybe someone has one and can trace a pattern on paper for me? Looks like I'm in the market for one!