Would the A-6F Intruder II have been intended to replace the A-7 Corsair II?
Short answerNo; it would chiefly have replaced earlier A-6 Intruders as the Navy's strike aircraft.
NotesThe hypothetical A-6F is separated from the electronic-warfare conversion discussed just before it. It is treated as an evolution of the Intruder strike-aircraft line. The proposed variant would therefore replace earlier A-6s rather than begin a new A-7 succession line. The designation discussion becomes confused, so the reliable takeaway is that the F model belongs to the A-6 family.