INVESTMENT FIRM BOOSTS AMERFORD <AMRF> STAKE Louart Corp, a Los Angeles investment firm, said it raised its stake in Amerford International Corp to 105,615 shares, or 7.8 pct of the total outstanding, from 69,715 shares, or 5.2 pct. In a filing with the Securities and Exchange Commission, Louart said it bought 35,900 Amerford common shares between March 19, 1986 and Jan 30, 1987 at prices ranging from 3.92 to 4.29 dlrs a share. It said it bought the shares for investment purposes and might increase its stake in the future.