The David versus Goliath Z story began half a decade before Brad Frisselle won the 1976 IMSA GTU Championship. After spending the last three years being a thorn in the backs of the BRE team in his Datsun Roadster, and snatching the 1969 SCCA National Champion D-Production Championship title, Jack Scoville acquired serial number HLS30-01543 to go SCCA C-Production racing in 1970. Scoville became the first privateer to represent the Datsun 240Z, when he participated in the 1970 SCCA American Road Race of Champions at Road Atlanta. He was the only privateer of the five total Datsun 240Z racers who had entered the race. Among them included John Morton and John McComb of Brock Racing Enterprises, and Bob Sharp and Jim Fitzgerald of Bob Sharp Racing. Both the BRE and Bob Sharp Racing teams had factory-backed cars, and more notably, six digit budgets for their race seasons. Unfortunately, any hopes of a massive upset met a quick demise when the car broke down after having completed only four laps into the final race. Regardless, Scoville had put up an extremely admirable effort, being that he was racing a privately prepared race car.
Scoville would return to the National Runoffs in 1972. After a heated battle with Rob McFarlin (240Z), Carl Swanson (TR6), and Frank Harmstad (914), Scoville finished the full twenty laps in a very respectable seventh position.