This is how I remember it, too:
https://www.hemmings.com/stories/article/do-the-math-1967-dodge-dart-gt-383
In previous article they show picture of GT emblem w/383-4bbl below it. The 383 was a late model-year offering on 67 Darts. So it would not surprise me if the FIRST 383 Darts had NO 'GTS' emblems factory installed. The grilles & trunk panels had 'GT' emblems. Likewise the interiors.
Also, not all 273-4bbls had emblems. My parents had a "Charger 273" with no exterior emblems other than the regular GT emblems.