I wouldn't count on the stud where the threads pulled out holding... You're best off helicoiling it while you've got things apart... helicoiling with the head already install sucks though. Which stud? Rear, center or front area? You can try just installing it and holing for the best, but don't be surprised if it fails.
Disintegrated gaskets cause a fair number of people to believe that the threads have given up when it's just that there's no longer any pressure against the nut when they remove them... that's the only reason I asked.
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