I'll add my 1.5 cents...
'67 had a ported vacuum switch too, that was built on top of the intake water elbow. It was used on 289's with T/E and A/C. Looking at the ones i have i couldn't find any date codes.
The earliest C8AE-A valve i have is 7-H-67. The latest C8AE-A is 9-H-69.
The earliest D0AE-A valve i have is 7-H-69. The latest D0AE-A (pat pend) is 3-H-71.
It appears there were two different molds at the Hanover plant being used simultaneously as I have both small and large letter C8AE-A and small and large letter D0AE-A.
I have two Pat Pend D0AE-A (one small letter, one large letter) with no date stampings.
I have one valve that is from the same mold as the small letter D0AE-A but is blank where the engineering number and "Ford" normally is, and has a date code of 11-79 with H-1934 beneath it (or above it, as it is stamped into the brass base upside-down.)
It would be my guess that Hanover was the supplier for San Jose, as I only have 2 Kalamazoo valves (dated 9-K-67 and 3-K-69) versus about 30 Hanover valves.
There is also a D3OE-A2A 2-port valve used in 1973 that screwed into the side of the intake water elbow, for the sake of thoroughness.