Has a College Football game ever ended 63-18?
Exactly once. On September 27, 2003, Texas beat Tulane 63-18, and no College Football game before or since has ended that way. When it happened it was a scorigami, the first 63-18 in league history.
That makes 63-18 the 1820th most common final score out of 2,216 that have ever occurred in College Football. One point away, 64-18 has happened never and 63-19 has happened 5 times.