Rod,
The spark plugs (one per cylinder) and the six intake ports are on the left side of the head, with the six exhaust ports on the right side of the head. The photo in the AHRF album just shows the left side of each of the three engines. A photo of the same three engines is on page 11 of Roger Huntington's 1951 book, "How to Hop Up Chevrolet and GMC Engines", originally published by Floyd Clymer, and now reprinted by Fisher Books.
Go to the "Inliner Rides" link on the left and find "Pat's '32 Roadster" for a good example of what a 12-port Chevy can do for a classic hot rod. You may need to click on "Want to see more? Click here for earlier postings" a couple of times and scroll down.
