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In all honesty, with compression numbers like that, the next course should be a tare down. Anything could have happened and most of those things could happen in an instance. I agree with removing the valve cover ,but jumping timing is highly unlikely. Best bet would be rocker arms out of place.
Looking at the plugs, looks like oil contamination, but could be just a rich condition from blowing the coupler and then not idling stoich long enough to clean the plugs. (Can't determine the texture).
If you happen to remove the head, you might see a clearer picture of what happened, if you didn't throw some rockers, that is.
Sent from my Highly Tuned Note4!!!
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