BOSTON — Wall Street focused this week on nominal changes in stock prices. However, most stocks have not yet made it back to their real-dollar peaks of two decades ago, according to Wright Investors' Service of Bridgeport, Conn. Adjusted for inflation, the Dow Jones industrial average hit its all-time high in January 1966. The average would have to reach 3,900 today to set a real-dollar record. On Oct. 13 the Dow closed at 2,569.26 after dropping 190.58 points, its second largest decline ever.