As third under Bruce Roberts he became the Minnesota state men's champion in 1977, and went on to win the nationals and earn a spot in the 1977 Air Canada Silver Broom, where the Americans placed fourth.

Pustovar was named the All-Star Vice Skip at the 1977 Air Canada Silver Broom.

He and his team participated in the inaugural Continental Cup of Curling and helped North America defeat Europe by a small margin.

He also represented the United States at the Karuizawa International Curling Championship, where he won the bonspiel title.

He participated in the 2010 Olympic Trials with Todd Birr, but did not get a chance to represent the United States, finishing third.

He and his team participated in the Medford Qualifier and finished sixth, earning a spot in the challenge round.

In 2012, Pustovar and a new team played in the Green Bay Qualifier, but placed fourth and missed the cutoff.

However, he earned a spot in the challenge round through his Order of Merit ranking, and finished sixth, failing to qualify for the nationals.

He was the coach of the Todd Birr rink at the 2007 Ford World Men's Curling Championship, where the United States won a bronze medal.