I can't answer your question specifically about the engine you are working on. Calculate the time difference between doing the timesert and the cover replacement to help make your decision. The new cover will be a better repair and perhaps you can freshen up other items in that process. A helicoil kit would cost a lot less but isn't quite as good IMO.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer