Since you didn't specify the year I'm going off the description only.
Either 67 or 68 would have used 526 Off White as the secondary color.
The primary body color was 514 Light Red. Together in a Conventional Two-Tone these code the 544 you are showing.
The Ditzler/PPG crosses for the paint codes are
526 = 8290
514 = 70704
Since 67 and 68 used different paint schemes on the roof plus there were a number of interior paint combinations, let me know the year, interior trim level and color code as well.
For general reference here is a 68 CST Longhorn in 544 (526/514) with non-stock side stripes.
For a Two-Tone scheme breakdown over the years you might want to read this.
http://67-72chevytrucks.com/vboard/s...12&postcount=9