Paciorek also played on Detroit's team in the National Amateur Baseball Federation; he was named most valuable player during the annual tournament in 1962.

[2] While he was still in high school, Houston general manager Paul Richards convinced Paciorek to sign with the Colt .45s; the two agreed to a $45,000 contract.

[3] In late 1962, Paciorek attended an instructional league put on by Houston, which led to him becoming part of the team's spring training roster as one of 63 invited players.

[5] After spring training ended, he began his professional career with the Modesto Colts of the California League and played in 78 games for the team with a .219 batting average and 15 doubles.

[5] Shortly afterward, however, Houston brought Paciorek and seven other rookies onto the major league roster to play in the season finale on September 29.

[7] In total, he went to the plate five times and hit three singles and had two walks, scoring four runs en route to a 13–4 Houston victory over the New York Mets.

[3] He had a perfect major league career batting average and on-base percentage of 1.000 as a result of his performance that day, something no one else with as many plate appearances as Paciorek has done.

[6] Paciorek was promoted the following year to the Double-A Waterbury Indians and played in 29 games with them, but tore his achilles tendon during warm-ups, which led to his release and the end of his professional career.

After graduating from college, he spent several years as an instructor at a Jewish community center, then became a physical education teacher after inquiring about a Christian Science Monitor advertisement for a teaching position at Clairbourn School in San Gabriel, California.