It appears that some of the questions can be answered in the "1967 Ford Engine Equipment Assembly Manual". However, since all Models are included, as well as all engines, with and without Thermactor, etc., it will take some time to sort through it. A quick look shows that a radiator with a different Part Number than the "Standard" radiator was
used for Extra Cooling and A/C. It also shows that the fan shroud is only used with Thermactor, and/or A/C. Then there is also an illustration that shows 289 Mustang with SelecAire and "Standard Cooling". This is in conflict with the Showroom Options book and the early (10/17/66) and late (5/29/67) Salesman's Price books I have, all of which note that the Extra Cooling Package is included with SelectAire. As I noted, this will take closer inspection and sorting through, but at least it's a place to start.
Bob