I've been looking for one of these for a while, finally found one! It's been sitting in an attic in St. Louis for 50 years, seems to be in decent shape. The model number is 78F85, serial number 1226. I believe the numbering usually starts with the year of manufacture (i.e. 37F85), so I'm a little confused about the "78." I thought it might be a unit for a '37 car that was made later in production?? It has a specially cast intake (not a stock unit, different mounting where the carb would go). It also has the pulley in back to put the generator on top of the head, which I believe is specific to the earlier applications (35,6,7).
I've heard John Erb is the guy to talk to about rebuilding, but I'm having trouble getting in touch with him. One of my dad's good friends rebuilds Auburn and Cord blowers, so I may send it his way for a look. The plan is to install it on my '36 Cabriolet once I get it rebuilt (assuming I can fit it under the hood).
Please let me know if I'm incorrect on any of my info or if you know anything more about the unit, there isn't a lot of info out there on these things!