BRM tells SWK that there is no scriptural barrier to lifting the ban.
Edward L. Kimball, "Spencer W. Kimball and the Revelation on the Priesthood," BYU Studies 47, no. 2 (2008): 46-47
In June 1977, Spencer invited at least three General Authorities to give him memos on the implications of the subject. Elder McConkie wrote a long memorandum concluding that there was no scriptural barrier to a change in policy that would give priesthood to black men. Considering Elder McConkie's traditional approach to the topic during the Lee administration, this conclusion explains why, according to Elder Packer, "President Kimball spoke of his gratitude to Elder McConkie for some special support he received in the days leading up to the revelation on the priesthood." Although minutes of quorum meetings are not available and participants have not commented in detail, the First Presidency and Quorum of the Twelve discussed the issue repeatedly, at length, and over a period of months.