Your decode is correct. I would add that the "1C" (note "1C" not "IC") means that is was assembled during the third week of January (1972).
Does it have a round speedometer or the wide rectangular speedometer ?
Does it have air conditioning ?
Is there a "GMC" on the dash above the heater controls ?
Is there a small oval "Fasten Seat Belts" light in the dash near the lighter ?
Does it have a round speedometer or the wide rectangular speedometer ?
Does it have air conditioning ?
Is there a "GMC" on the dash above the heater controls ?
Is there a small oval "Fasten Seat Belts" light in the dash near the lighter ?