The date seems to match the production sequence. What do you think?
(http://www.geocities.com/musclecar_usa/bb19_3.jpg)
18N350028 should be an 11D or 11E build.
S24 = November 24.
I'd say the date stamp lines up with the VIN.
Matches my 11E build date 68 Z28 survivor, N351124,
Jerry