I've had pretty good service life from O2 sensors in my car, no issues to date. Never needed an extender. I'd be investigating all the root cause type issues. Like is it positioned correctly, not too close to the head? Is the bung above centerline of the pipe and angled down slightly? ( Prevents condensation from settling in sensor) If all those are correct, I'd be investigating the wiring. Ask Holley how to troubleshoot the different values on the main connection, especially the heater to make sure it's working. You shouldn't be repeatedly fouling sensors. All this assumes good engine health. It's not burning excessive oil right? How do the spark plugs look?
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'65 Tempest 467 3650# 11.30@120.31
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