Out of town on business through the weekend, so I don't have any refernces with me.† However, from the notes I keep on my computer regarding my carb (7029110) I'll take a stab at your numbers, 7029112............302CK8L, as follows:.
70 Prefix Code; Rochester; 1965-1969
2 Decade Produced; 1960ís w/o A.I.R
9 Model Year; 1969
1 2 BBL; Federal Stds.
1 GM Division; 0, 1, or 2 = Chevrolet
2 Transmission; An even # as the last digit = auto transmission; I know that 0† is without A/C; I would assume 2 = with A/C
K8 Month/Year Built = November, 1968; agrees with the tag date of Nov 8
302 = 302nd day of the year?† (Oct 30, 1968?)
C, L;† Inspection or production line codes?
If my assumption is correct, this looks to be the original carb.