I got to thinking, maybe the coordinates are to the CIA courtyard AND to some keyword in the K4 text.  I matched the numbers to the letter in K4 (i.e. 38th letter = T).

38
57
6.5 (6 & 5, or 65)
77
8
44

Gives us Taoudos or Taydos

Or, nothing whatsoever.

I’m glad I tried though, it serves to get me going in a different direction.  I was pretty hung up on manipulating the text of K4 in some way that would reveal the answer but now I’m looking for alternative means.  This was the simplest but it’s still nice in its own way.

Kryptos Fan

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