Just hopefully the chain didnt break. Lets just pray. At that mileage, its bound to go. I have got 3 126 V'8s and 1 107. I have more to worry about than you do. When you changed the valve seals, didnt you have the valve covers off anyway? I guess you could of checked the chain and tensioning rails. As for the blue smoke on the plugs, I have never heard of a timing chain break and then having 3 plugs going bust.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6