I saw three of those four games in '79 in person. Saw both games with OSU and the one in Norman when OU beat the favored Bevos, 71-65. The game in Dallas was maybe the best game an OU team of the era played - they just pummeled UT in the NCAA first rounder at Moody Coliseum.
Texas was definitely favored in both games in '79. OSU wasn't much back then but was kind of a "thorn in your side" kind of team. We actually had an easier time with them in Stillwater than in Norman.