Alldata's VECI labels only go back to 1982, AutoZone's for the 1978-1979 Fairmont use a lot of 2.3 - 4 banger diagrams.
BUT this document gives all the basic diagrams and the best Non-Geek Speak explanation of every emissions system device known UP TO 1968.
PLUS, it gives complete and clear VACUUM Issues Diagnosis for all the I6 and V8 engines, both for Manual and Automatic transmissions from the 170 CID and up to the 300 CID sixes and all the SBF and BBF V8s.
Its kinda like that book, "Everything You Wanted To Know About He-ing and She-ing", only the pictures are in black in white!
http://www.mustangtek.com/Library6/V...Book-5000.html
The basic VECI Diagrams start at page 31 but the details on them start on page 29.
And while you're there, check out the other menus as well as all the Ford TECH and Sales books. Most are in PDF format.
http://www.mustangtek.com/LibraryFordTech.html
http://www.mustangtek.com/index.html
I found the site looking for VECI diagrams using the part number on an old label.
Since mine started out as a Mexican-built V8, it didn't have a VECI label. When I swapped in the 1978 freshly-built 200 CID. it's label was NFG, and now that I'm changing to tri-power AND 4-speed manual trans, I know I won't find one! LMAO!!!, but some of the vacuum circuits make sense, because I also have the factory AC, which uses vacuum to not only operate the vents inside, but also manage the IDLE and advance to keep the engine temperature within limits.
EDIT: Info on dead websites:
The WAY BACK Machine is a US donor archive of almost every website since the WWW began. I had a problem which Windows 7.1 diagnosed as a network issue to the MustangTek.com website, so I went here and used the WAY BACK Machine from here:
https://archive.org/
or here:
https://archive.org/web/
It had copies of most of those documents, as if you were looking at the actual site.
I'm sure there's a lot of old sites with good documentation of our older Fox-bodies too.
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