NEW YORK—Investors unnerved by the fallout from heavily indebted Chinese real estate company Evergrande were gauging the potential for a wider shakeout after a selloff hit stocks around the world. For now, many U.S.-based investors believe there is little chance that the woes of Evergande, China’s second-largest property developer, could morph into a systemic crisis reminiscent of the 2008 collapse of Lehman Brothers. Still, with valuations on U.S. equities stretched on a historical basis and an unwind of the Federal Reserve’s easy money policies looming, some worry that a sudden drop in risk appetite could leave global markets vulnerable to a broader selloff. “We have a very cautious view on the market given elevated valuation levels,” said Rob Romero, portfolio manager at Connective Capital, a technology hedge fund with $100 million in assets under management. “It is hard to know how far the contagion will spread. We are looking for …