Talked with Randy this am and he didn’t recognize it.
He did help to likely rule out Continental though. Mostly due to the fact your engine is OHV.
Looks like they weren’t making OHV engines in that time period.
Here’s a list of Passenger car engines they were making between 1920 & 1959
Here’s a pic of some of the truck or commercial engines from around the ‘50’s as well. Different architecture.
And so the hunt continues...
Somebody out there will recognize it.