Not sure which month it started, but September '61 would be pretty much "on the button" as the cars were introduced in September of '61. A good guess would be that they started in August, possibly July. Although someone out there probably has very accurate stats on the subject. Either way, an all original '62 327 is a great find. An early date makes it interesting anyway.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America