Help reading spark plugs

I figured I would just start out with the 3923, it has been a favorite for a while.

I hope to get a little more time on the throttle this weekend. It seems to run pretty good, with it's current tune.

As far as the detonation, it never has liked pump gas ever! I may have to go to another set of heads with larger chamber volume, or some aluminum ones to ween it off of the high test liquor it seems to crave.

Thanks for everyones input, I may try another set of hotter plugs in the real near future, and seriously looking into the wideband 02 sensor option as well.

I ulimately want to use a multi point fuel injection option, right after i get my HDK k-member and front suspension, get it re-painted to hemi orange and finish the interior. LOL