Just for reference, we have an all matching numbers '70 Stage 1 that has a trim tag date code of 04A (first week of April), the date on the big Fisher Body sheet that was tucked in the dash is 4/1/70, and the date on the buildsheet that was on top of the gas tank is 4/13/70 and the original 7040246 LK carburetor is dated 0150.
I have seen the 0150 246 stage one carburetor as early as the beginning of March. Thanks for the information.