After interviewing three finalists, selectmen are expected to make a decision on a new town manager at their meeting tomorrow. The person chosen will replace longtime administrator Steve Rollins, whose contract runs out in June. The finalists are Bridgewater Town Manager Troy Clarkson, Bourne Town Administrator Thomas Guerino, and interim Ipswich Town Manager Thomas Younger, who was Belmont’s town administrator until January. The three were chosen from a pool of applicants reviewed by executive headhunter Richard Kobayashi of the Edward J. Collins Jr. Center for Public Management at the University of Massachusetts-Boston. Kobayashi was hired by selectmen to lead the search and screen candidates for the post, which will pay about $130,000 a year. - Michele Morgan Bolton