It's a 3 row radiator. Just trying to determine if it's for a GTA, Shelby etc. C7ZE-E1 is the code but I don't see anything for E1, only E2 (390/428). it's an Auto.
Lets see if this will help First I would not get hung up (for your purposes) on the E1 verses E2. Likely just a slight change or improvement between the first and second generation
Appears - according to buildsheets the E's were used on year 67 S code automatic Mustangs. Likely for non AC automatic 390's by the example below
Below is an example of a buildsheet with the radiator identification from 7T02S1562xx
Of course Bob has already helped you determine that the supplier of your radiator supplied the two eastern Mustang plants and not San Jose
Later in the production year Ford changed to
-Z for AC cars and -V for non AC 390 automatics