The autozone stuff seems to work for me. Just keep the receipt in a memorable place on "lifetime warranty" stuff in case it comes time to replace them again.
Plug gapping is important, otherwise, they make a spark and the gas goes boom -- so I'm not picky there.
I timed by ear and it bumped FE a bit (maxed out the advance). There's some ping at full load at high IATs, but those moments are rare. Basically advance at idle until you hear knocking, and back it off a bit (fully warm engine, ECU bypassed).
RH77
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