decoding/numbers

[dan the man]

Hi, My car body has a build date of 04A on the trim tag. The first week in April 68 started on a monday. The last 6 numbers on the VIN tag is 407219,  Norwood built 1968  RS/SS 396,325hp. The sequential unit number is 107276. What would be the assembly date of the complete car Any help would be appreciated, thanks!