NEW YORK (Reuters) -As Wall Street draws the curtain on a tumultuous quarter in which stocks logged a record high before tumbling into correction, investors are faced with a mountain of policy uncertainty that clouds the outlook for coming quarters. The S&P 500 Index finished the quarter down 4.6%, its worst first three months of a year since the first quarter of 2022. Investors, who started the year with high hopes for pro-growth policies from the Trump administration, have been spooked by a barrage of tariff-related headlines.