CalFed Inc. said it has agreed to acquire First Central Bank of Phoenix for undisclosed terms . . . San Francisco-based First Nationwide Bank said it has completed the purchase of Capital Savings & Loan Assn. of Phoenix, Ariz., for an undisclosed price . . . Air Canada has signed an agreement to purchase four Boeing 767-200ER jets worth about $220 million, Boeing announced. Air Canada also said it is considering options for six more 767s . . . Montgomery Ward & Co. announced that it will transfer its apparel buying operations from New York to the company's Chicago headquarters by early 1988.