Thanks for the picture. It sounds like things are; "so far, so good". I'm anxious to here if there is any damage to valves.
Did you figure out the ratcheting tensioner okay, and what I mean by pushing the plunger all the way through then starting it through again? Make sure you barely start the tensioner, so it's not too tight when you're putting the chain in place.
Does the point of chain failure appear to have worn through anywhere, or do you think it just stressed and broke?
I'm still crossing my fingers for you as far as further damage goes.
Best of luck,