47 V8 ignition mystery

[Old Henry]

Originally Posted by 47topless

Checking for vacuum leaks is good but, as you know, the distributor requires a viable source of vacuum in order to operate correctly. Have you checked for obstruction in that vacuum source line? Are you sure the distributor is receiving sufficient vacuum?
Going back through the volume of past posts to this thread, I do not find any mention of that. If I missed it, I apologize for wasting your time here.
Good luck with your car and hope you're back on the road soon.
Phil

Thank you for that suggestion.
I just removed the distributor to check it out again and blew through the vacuum line from the distributor to the banjo fitting under the carburetor.
No obstruction.