I guess NGK tech is saying a "4" heat range would've been stock? I run a "6" heat range (BKR6E, for an edelbrock head) normally aspirated. And I don't disagree with the projected tip for normal driving. Mine are as well. But I was hoping to find a non to try as well. Same deal as you, electronics that won't tolerate noise.
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'65 Tempest 467 3650# 11.30@120.31
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