In a thrilling, heart-pounding finish, Gil Johnston’s Mr. Hot Stuff came back in the last strides to nip Robert Kinsley’s Modem in the Far Hills Races’ $400,000 Grand National by a nose on Saturday. Buttonwood Farm’s All the Way Jose finished third, another nose back in America’s richest steeplechase race. A competitor in the 2009 Triple Crown races, Mr. Hot Stuff was the oldest runner in a field of seven in the 2 5/8-mile Grand National, a race that attracted three overseas competitors, all of whom ran somewhat disappointing races over Far Hills’ lush, firm turf course.