I haven't looked at the plugs recently, but they were carbon coated on the outer collar. The firing electrode area seemed ok, not white, more a light grey.
With the JC pipes back on, initially I had the new 2.68 NJ's and new needles at the second notch. I had removed the old 2.66's and needles.
The overrun noise was too much however, so I replaced the 2.68's with new 2.66's and slightly tweaked the mixture screw a little leaner. That helped quite a bit.
So now the setup with the JC's is K&N air filter, 2.66 NJ's and new needles @ the 2nd notch.
Now I just need to get the cables synched just a tad better and I'll be happy.