FYI - FoMoCo designated them 2 Dr. Hardtops from 1965 up to and including 1978. When the new "FOX" body was introduced (1979-93), they where officially designated 2Dr Sedan. The term coupe officially began with the introduction of the SN 95 platform in 1994. The terms coupe, notch, notch back and trunk are common lexicon and interchangeable for this body style but not technically "correct".
As always, this is my opinion. Yours may differ.