Has an AFL game ever ended 83-66?
Exactly once. On June 24, 1922, Carlton beat Richmond 83-66, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 83-66 in league history.
That makes 83-66 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 84-66 has happened 9 times and 83-67 has happened 7 times.