E-3 plugs worth the money?

yellow rose said

Not true. The failure rate of NGK is going through the roof right now. Search the web. It's out there. And then there are the knock offs that are having about a 95% failure rate. Guys are pissing away a bunch of time, effort and money only to find out they have a plug issue.

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In the last month I've had 3 NGK copper cores go bad in my 67 Dart (360 Magnum OEM head) that I race, all in different cylinders. I run an MSD 6AL and realize a multi spark is hard on plugs, but my street car is also MSD 6AL and the Autolite 65 coppers (340 J head motor) have been in for over 2 years with no problem.
I'm going to put a few Autolite 3923 and 3924 copper plugs in and see what heat range the motor likes.