Re: 427 TUNNEL PORT
I don't think ANYTHING came from the factory with tunnel port heads. I believe they were a parts option after the car was purchased. I doubt you could have gotten ahold of them without knowing someone big unless the factory recognised you as a contender in the race circuits. Maybe my history is off, but I don't think that Ford developed the true Hemi head design. I don't remember anything in the 50's from Ford with a Hemi. I do, however, recall a ton of Chrysler products with Hemi's form the early 50's.
As far as I am concerned the Tunnel Port was designed for the Side Oiler 427, which LOOKS similar to any FE, but that is where it ends. Totally different animal that a production FE anything. They were (sideoilers) an option, but good luck getting one back then, as they were in short supply from the get-go. Ask Carrol Shelby, he could not get enough of them for any amount of production of the shelby auto's. Very, very few Cobra's left the Los Angeles facility with true 427's most were 428's. Alot of 427's were transplanted later as they became available.