I would like to confirm if these fasteners are correct or not. Naturally I assume they are, but it wouldn't be the first time I was wrong and probably not the last
To be sure, the full dimensions of the bolts are needed. A picture may be worth a thousand words, but the sizes are more important.
Example: the second picture in this post, the "NL" head markings, are bolts with external tooth lock washers. The book says it's a bolt with a split ring lock washer, 43490-S8 (AM020 pg22, 5/16-18X3/4Hex).
Did Ford even use carriage bolts?
Yes. A lot, OK a few. I can't find the 67 drawing showing what I believe to be an adjustable bumper for the clutch pedal which i think uses a carriage bolt. Let me look some more.
Jim