Post some pic's of the plugs.
Try to keep them in order by cylinder.
Get the camera angle where you can see down in the plug while showing side angle of the ground strap so we can read the timing make on the strap.
I will get the plugs out later today (maybe lunch?) and post pics. I am willing to try/test whatever is needed. I do failure analysis on engines (new, modern fuel injected overhead cam, etc) for a living, so I am comfortable with most tests, I am learning more on the testing/tuning, etc on our carb engines.