72 340 Auto 6139S Thermoquad

Good point. I have always thought the date code was a 3 digit number for the day and the single digit was the year. from what you indicated a year code of 9 would be 69 or 79 which both don't add up for that model number. For that reason I go with the model number code which is correct for a 72 340 and it from everything I see it is an early 70's carb.