Oh foul plugs...

[HSSS427]

Pulled the plugs today to try and see if I have any ability to do a "reading." (Can't help but think of the psychic hotline when I hear about people reading plugs )

Needless to say, #1 plug was pretty easy - it's covered in black soot ie carbon fouling. #2 and #3 look relatively ok and if anything too clean and indicating perhaps too much advance. #4 seems between the 2 and probably the most normal looking.

So, one thing I can't seem to find an answer on is, what do you do when you have completely different looking plugs? I can't say I've been overly scientific about this and should probably start with a new clean set to make sure I'm getting an accurate read on current engine set-up.

These are Champion RC12YCs. My research also seems to indicate this plug may be too hot for my set-up - 10.5:1 compression, 566 HP, ported aluminum Shelby heads, Edelbrock Performer RPM intake, Mighty Demon 750 with #78 jets front, and #82 rear.

Now looking at NGK plugs in the 6 or 7 temperature range, which would be 1-2 ranges cooler than the current Champions.

Appreciate any help from the ignition mystics out there!
Thanks!
Scott