The printed notice of change to the 289 2V was dated Oct 67 (a couple of months into 68 vehicle production).
Al, the 68 R code and GT-E R code cars should be called out as well.
You’re right Bill. I was mentioning the Ski Pac as an example of regional special editions and should have said 69. I’m pretty sure there were no 68 Ski Pac specials.
To get back to your list… here’s an update of suggestions (I think you mentioned you wanted 16 cars for the poster?).
Cougar 302-2bbl (289-2bbl introduced November 1967)
Cougar 302-4bbl
Cougar 390-2bbl 6.5 (also available with 4bbl)
Cougar in two-tone (also available as XR-7 and with all engine options)
Cougar XR-7 302-2bbl (also available with 4bbl)
Cougar XR-7 390-2bbl 6.5 (also available with 4bbl)
Cougar GT 390-4bbl
Cougar XR-7 GT 390-4bbl
Cougar GT-E 427-4bbl
Cougar GT-E 428-4bbl CJ RA (introduced May 1968)
Cougar XR-7 GT-E (427 and 428 CJ)
Cougar Dan Gurney Special (also available in XR-7)
Cougar XR7-G (302, 390, 428)
Cougar 500 GT (skipping base 500)
Cougar Calypso Coupe
Cougar Rocky Mountain Special