Hey guys.
I got the spark plug out with a #6 ez-out.
The advantage I had was the plug sheared off just below the nut, so the whole core and electrode came out in one piece. No need to drill.
I treated the "thread body" with penetrating fluid, tapped the ez-out lightly with a hammer to get it to bite and then gently used a 1/2 inch drive breaker bar to crack it loose.
Worked slick.
Went from a $1400 head removal estimate down to $8.95 and some hair loss. Whew!
Again thanks to all who offered their help.
C'