8:15 a.m. Update: Stock futures were modestly higher Monday as automaker Ford Motor posted a surprise profit and investors awaited key reports on manufacturing and housing. S&P futures were up 6 points in the pre-market. Dow futures rose 46 points, while Nasdaq 100 futures gained 4 points. In company news, Ford (F) posted a third-quarter profit of $1 billion, or 29 cents a share. That was up from a loss of $1.31 a