Yes, that's him in row two with his #55 Vega at Martinsville in 1979 behind George Kent #41 and Richie Evans #61 and next to Ron Bouchard #7.
Mark won three Modified features in his career and they all came in July 1978: Lancaster (7/1), Perry (7/9) and Spencer (7/28).
He passed away in August 2012 at age 57 after a battle with cancer.