1937 No start

[Kojack]

nemwOO1

Is the cam gear pressed on or bolted to the cam?
If pressed on might have slipped on the cam throwing valve timing off even if crank & cam gears dots are aligned properly.

Not a common thing but a possibility. This is only help I can think of.
You seem to have exhausted all other causes.

PS. The exhaust on this vehicle isn't plugged I hope. Like a plugged up muffler?

Hope This Helps You Kojack