Great Western Financial Corp. said it has called off its previously announced plan to acquire Fort Worth-based United Fidelity Life Insurance Co. . . . McDonnell Douglas agreed to pay $20 million for 800,000 preferred shares of Republic Health and to obtain 1.9 million shares of common stock through the exercise of options at an average price of $18.40 per share; the deal will give McDonnell a 13% stake . . . Federated Group said it expects to report earnings for the its' fiscal year ended March 3 of about $16 million, up from $11.7 million reported a year earlier . . . Texaco said it completed the previously announced sale of its Hawkeye Chemical unit to newly formed Hawkeye Acquisition Corp.; terms weren't disclosed . . . Standard & Poor's placed Burroughs Corp. on its 'creditwatch' list with negative implications. It also placed Sperry Corp. and Sperry Financial Corp. on the list but with positive implications.