Also ... today I discovered that some of these parts came from a hearse. Hmmmm.
Not necessarily from a hearse.
Henney built custom bodies for commercial vehicles and trucks as well as limousines, taxicabs, buses, ambulances, and hearses.
Maybe the Professional Car Society can help you with the Henney serial number. Where was the Henney tag located?
https://www.theprofessionalcarsociety.org/Also, the name of the company was changed from John W. Henney Co. to Henney Motor Company in 1927
You can find out more here.
http://www.coachbuilt.com/bui/h/henney/henney.htm