Read my Plugs

Those look kindof like mine did when I was running the 292/508 in my 367Eddie-headed streeter. Extended Idle-time, and low-speed operation did that to mine.They never misfired and cleaned up on a power-run,( Accel SuperCoil;the big ugly one.)
Currently I'm running Copper Champions;like 12s IIRC. I bought a new set to put in, in the 3rd or 4th summer. That was about 2004ish. But they're still in the glovebox.My engine seems to be happy with those.Maybe this year.