Here is an article on the Edmunds company from a 1952 Popular Mechanics magazine.
http://books.google.ca/books?id=jNwDAAAAMBAJ&pg=PA120&lpg=PA120&dq=eddie+edmunds++heads&source=bl&ots=iKasbAXrhe&sig=d3kLQYxwIKyUojZeVgU9vZprEAg&hl=en&ei=HVZ4Tc2aFITWtQPBnbCDAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBQQ6AEwADgK#v=onepage&q=eddie%20edmunds%20%20heads&f=false
It includes a shot of a mechanic installing an aluminum head on a Packard.
He had quite a big operation, with 50 men employed in manufacturing and installing speed equipment.
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The box in the pic above carries an address in Kansas so evidently this is not the head that came from Vermont.
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