Naca became a coach in 1968 and is best known for his association with Farul Constanța, which he led to all six of the club's Liga Națională titles, between 1974 and 1997. His time with Farul Constanța included a run to the final of the 1986 Toulouse Masters. He was Romania's coach at the 1987 Rugby World Cup, where they came third in their group.[3]