Marchinko was a junior star with the Flin Flon Bombers in the late 1960s. Though he went undrafted the Toronto Maple Leafs gave him a shot, signing him as a free agent. Over the next three seasons he played with the farm team in Tulsa (CHL) while appearing with the Leafs for a combined total of 5 games.
The expansion New York Islanders selected Marchinko in the expansion draft in 1972. Over the next two seasons he would appear in 42 games with the Islanders, while increasingly bouncing around the minor leagues. He had 2 goals and 8 points in his time with the Islanders.
Marchinko continued to play pro-hockey until 1977. He quickly found good employment with CN Rail until he retired in 2009. Living in the Chilliwack, BC area he continued to work in the summers with the iconic tourist train travel package The Rocky Mountaineer, taking tourists from all around the world from Vancouver to the Rocky Mountains.
Marchinko would spend his winters playing golf in Palm Springs, California.