46 WF-32 smoking bad stopped running

[Jorojo]

I have a 1946 Dodge WF-32 with a flat head 6. 236.6 cid. Run this truck almost daily. Smoked a little all the time. Today I was running the truck when it started smoking, a lot, after a few seconds it died. I assume the plug fouled out. It would try to restart, fire, but would not catch. 

What do you think I have here? Valve guides, rings, worse, ??

Thanks in advance for sharing your knowledge.