I don't have a 67 manual, but the 68 version has a date in the lower right corner of every page, by the page number. The 67 doesn't have that?
Dave : I just checked my original (as opposed to my scanned) version of the 1967 Vacuum Diagrams Manual, as well as my 1967 Wiring Diagrams Manual - neither has any dates except as I noted in my previous reply. Seems kind of odd that Ford did that. Maybe that's why the 1968 does have dates...
Bob
+1 on Bob's comments about "No dates"
I can add regarding vacuum hose routing (and most ANYTHING on a 67 Mustang for that matter), having a little better understanding of
some of the running changes in the vacuum hose routing of the '67 model year of Mustangs, that a restorer MUST FOLLOW OTHER EXAMPLES WITH SIMILAR BUILD DATES when determining how an example they are working on ought to be restored. These manuals are guides only, not always what was used on the production line, often (as in the case of this '67 model year [all Ford Cars for '67] SERVICE TRAINING Vacuum Diagram manual), these illustrations were assembled AFTER the production year began and in this situation, do not indicate any of the "Running Changes" at all for '67 Mustang models.
If a restorer needs a better idea of what they ought to duplicate for their project, a restorer might request or research more other original examples of their specific needs.
For 1967 Mustangs, I would have to say that it has the most number of Running Changes of ALL the Classic Years (64-1/2 to 73). Some of the dates of some of these changes are still only pencil marks in some of our notes.
Regarding Vacuum hoses for 67 Select-Aire systems, another variant could include Select-Aire cars ALSO EQUIPPED with Tilt-Away columns. Some later versions had a separate canister under the battery (read as two canisters) and some early versions had just the one under the right hood hinge (oblong canister) and a special "T" was used under the dash on those early versions. THIS IS NOT DETAILED ANYWHERE YET FOUND when these changes occurred, yet some illustrations Ford provided do show this "T" under the dash. (seen in the Osborn Manual for example, and found on October built original examples). Estimations so far have the change-over in about November '66. Still looking for more original examples to nail that particular one down. (my 11/2/66 SJ built example with Select-Aire AND Tilt seems to have been included in the EARLY version, but it had been tampered with long, long ago in a Galaxie far away).
Let's NOT get started on cars with Tilt without Select-Aire, that is another rabbit trail for another thread.