As of Apr 2025, this page is a bit of a mess, with James having 3 different families at the same time, but the family with Nancy Moorman looks reasonably accurate. The date for this marriage is given as 26 Sep 1760 in Louisa County, Virginia. There is no source.
Says she married James Board in 1760 in Bedford County, Virginia. No source given but there is a note about her maiden name that implies that someone has seen her marriage record.