Board Thread:Questions and Answers/@comment-11836-20170208210806/@comment-11836-20180116061037

King Kong is confirmed as being part of 616 in Official Index to the Marvel Universe Vol 1 9 under Uncanny X-Men Vol 1 349. Albeit it is a topical reference (since it involves the World Trade Center), but it apparently happened in the past (then "recent past"). I assume that it happened in the 70's (since the then remake involves the WTC, not the original).