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Thread repair kit arrived today. Read and printed up instructions first. Kit did not include 17/64″ drill bit needed nor did it include a small Allen Wrench needed to adjust the stop. The hole with bad thread was drilled out in two steps, first with 15/64″ followed by 17/64″, Better to shave off a little bit at a time than to try to get it all in one shot.
The tap provided in kit easily cut the threads,
Inserting the thread insert did not go well until I understood the tang was on leading edge not the following edge. Breaking off tank after insert is in place finished the thread repair.
Installed cylinder head and torqued the bolts. I promise myself to be more careful in future.