Sperry Stage III a bomb?

["Korolyshyn, Dan Mr. DAC DPW ENGR RESOURCE MGMT BR" <Dan.Korolyshyn@domain.elided>]

To make a long story short, after a year of struggling to get a Stage III
head from Sperry Valve Works, the second head that I received from them
turned out to be a 2.0 liter head with a combustion chamber that my 
Alfa mechanic here in Italy says is not acceptable for my US spec 1979 Alfa 
Spider engine.  The Sperry head is not a motronic head but has a combustion
chamber which the mechanic says is deeper than the one on my car, whose
head I have not taken off yet as I don't want to take my car off the road
until I get all of my parts together for an engine rebuild.  The mechanic
says that I can not use this head which is probably off of a two liter 
Alfa 75 (Milano).  Does anyone have any experience or knowledge about this
issue?  Your thoughts would be greatly appreciated, thanks.
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