Numbers crunchers. Carburetor question?

What would you think is the most correct date code for a carb for a 1971 Duster 340 with a SPD of July 9th, and the engine was forged on January 19th 1971. (matching #s car)
#1 March 24th 1971
#2 July 1970
#3 June 30th 1971