By Philip Blenkinsop DUBLIN (Reuters) - Companies would race to profit from a free trade agreement (FTA) between the European Union and the United States, bringing a near instant boost to both economies, the head of the U.S. Chamber of Commerce said. "If they made a deal tomorrow, U.S. and European companies are sitting on a boatload of cash and they'd be moving this thing up as fast as they can move," Thomas Donohue, president of the U.S. Chamber of Commerce, said after a EU-U.S. trade conference in Dublin.