That game did indeed go to overtime. Pulaski County outgained Salem 182-127 that night, but I think turned it over in the red zone a couple of times. Future Glenvar, North Cross and William Fleming coach Lee Johnson tied it in the last minute of regulation with a 30-yard field goal, then won it in OT with a 32-yarder. PC's kicker, usually a good one, missed three attempts in the game. According to the article that I have on the game from the Roanoke paper, Salem's Marshall Samuelson was 2 for 21 passing the ball, with one interception. IIRC, Samuelson was filling in for Timmy Smith, who missed a few games for disciplinary reasons. As you say, it was a classic defensive struggle.
Just prior to the beginning of the season, PC tailback Dion Hendricks had told the Roanoke Times, "I guarantee we'll beat Salem." Didn't quite work out that way. After the Spartans beat the Cougars for the second time in a row in '87, animosity between the two opposing fan bases escalated, and the series took a two-year hiatus - the only two seasons in which Salem and Pulaski County haven't played each other.
I remember as I was walking back to my car after that '87 game, some woman from Pulaski County, who was driving slowly by, saw my Salem hat and seat cushion and started letting me have it. Ah.....good times. I'll expect better behavior from DP and Navy, if the Spartans are fortunate enough to prevail this September.