They're nice, and they do serve a purpose. Over on the FE Forum we have a lot of the original Ford blueprints, in hi-res scans, available for perusing. They come in handy when settling disputes over arcane FE trivia, like the jiggle-valve for instance.
Here's a link to some, if anyone's interested:
http://www.supermotors.net/clubs/sup...try/1777/17269