The digits as found on the left side of the carb:

1705 8241
2367 BLT

Thanks!

1705 8241
1705 = 1976 - 1979
8 = 1978
2 = Quadrajet (4 bbl) Federal standards
4 = Buick Division
1 = Manual tranny

2367 BLT
not sure about these numbers but they could be:
Assy date and plant
236 = 236th day of
7 = 1977
BLT = Production Plant code