Here are some Technical Service Bulletins (TSBs), Autolite Shop Tips articles, service articles, and the like dated from the late 1960s into the early 1970s. They're another source of engine technical information beyond what you can find in the Ford service manuals.
Sun Electric Corporation Technical Bulletin dated September 26, 1968 (courtesy of Jim Woods)
This bulletin includes descriptions of a change in the air-fuel ratio for 1968 Ford vehicles, the starter delay relay for 1968 Mercury vehicles, and 1968 428 Cobra Jet tune-up specifications.
More to come as we acquire additional content.