Two pass-interference calls on St. Louis corner-back Lee Nelson set up Dallas touchdowns and late-game interceptions by the Cowboys' Cliff Harris and Charlie Waters protected a 30-24 victory over the Cardinals today.

The victory kept Dallas unbeaten in four games of this NFL season in preparation for a visit Sunday from the 3-1 Washington Redskins, in their annual crucial NFC Last Division battle, St. Louis fell into deeper trouble in the East Division race with a 1-3 record.

Cardinal coach Don Coryell started Terry Metcalf today at running back after using the Redskins and the all-purpose back touched off St. Louis latent big-play offense.

In the second quarter, another performer who has been used part time. Tpny Dorsett, also took off from scrimmage and ran 77 yards for a touchdown for Dallas.

The fireworks continued when Jim Hart hit wide receiver Mel Gray for a pass that turned into a 60-yard touchdown to put St. Louis ahead, 17-10.

The Cowboys cut the Cardinal advantages to 17-13 on a 40-yard field goal by Herrera.

The Cardinals were driving toward' a score near the end of the half when Hart was sacked by defensive end [TEXT OMMITTED FROM SOURCE] Nursing Pages