From the pictures, it appears to be the "Tom Muggleton Blue Magic" head.  A one piece unit with the plug coming out at an angle toward the rear of the head.  A very good head and somewhat alleviates the infamous "Fox Burp".  Not in all cases, but in many.  It also increases the torque in the "hard Four" setting.

  Bigiron

Yup, a Blue Magic Head, one of Tom Muggletons best products.  It would have been dark blue originally - running darkened its color as it did mine.  I think you will like it.

Thanks Marv, I thought the "Blue Magic Head" would be blue in color. This head is black.
Does Tom still sell the heads?
If it is indeed a Blue Magic, I'll use it. If not do you sell your modified Fox hemi heads?

  Jerry, I cannot answer your question on the availability of the Blue Magic head as I do not use them (although I do have a couple).  As some one else already stated, they DO get darker with usage (especially if the user happens to get a lean run).
  I do not make Hemi-Heads for sale anymore, but what I do is, if someone  buys a Fox mfg Hemi-Head, I will put the latest mods on the button so the user will have the best version.  This mod will be at no cost other than the postage.  There are five (5) steps to modifying the head button.
  There are Four  Hemi Heads for the venerable old Fox Stunt 35.  The Blue Magic,  L & J  head available from Larry Foster,  The Randy Smith head available from RSM and the Fox Mfg one.  All do some good to the power or run of the engine.  (I personally like the Fox mfg one, but I am biased)

  Bigiron
 
  Bigiron