Hmmmm- - - -interesting! I haven't encountered that type of head, apparently. Is it the one with the integral intake manifold? If so, have it magnaflux-checked for cracks before you invest a lot of time and money in it. They're notorious for warping and cracking.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!