I was just able to catch up on my B-Greek digests today. The Eph. 4:8
passage that Paul is apparently translating from is from the Targums.
Two articles that discuss this are:
Richard Rubinkiewicz, "PS LXVIII 19 (= EPH IV 8) Another Textual
Tradition or Targum?" _Novum Textamentum_ 17 (1975): 219- 244.
Richard A. Taylor, "The Use of Psalm 68:18 in Ephesians 4:8 in Light of
the Ancient Versions," _Bibliotheca Sacra_ 148 (1991): 319-336.
I hope these are of help to you.
John R. Russell
ThM student
Baptist Bible Seminary