Byron - I did blow out the compartment at the burner and took off the burner cover to inspect. It was very clean. I'll also blow out the flue above the burner.
Now have it hooked up to a newer regulator and only 2' of LP line instead of the 15' I was using before. Noticed already the flame is bigger than before and the pipe off the boiler is getting hot like it did on 110V operation. I'll run it this way for the night and check fridge/freezer temps in the AM.
I hope I am not premature in saying this but I think the long LP hose I was using before caused to much pressure drop. Then again the original
Boler regulator I was using before may have gone bad, or both situations. I'll replace the regulator anyway because it's 40 years old.
Crossing my fingers (a non diagnostic procedure).