Americans in the Deep South have a greater chance of dying from heart disease than Americans west of the Mississippi, the American Heart Assn. reported in its annual update on heart disease statistics. South Carolina had the highest death rates for heart disease. Its rate was 258 deaths per 100,000 people in 1987. Next highest were Mississippi, West Virginia, Louisiana and Georgia. Hawaii, with 160 deaths per 100,000, had the lowest rate, followed by New Mexico, Colorado, Minnesota, Montana and Arizona.