It doesnt have to be a gn or gnx to be fast.
Alot of people like V8s and Regals have em. Nigel said dual exhaust so Id assume it had a 350 in it. It probably had the typical Holley 650, headers, cam and camel hump heads. Which of coarse give it 400 greaser hp. Greaser hp being what alot of old school carb guys think their mildly done up 350s put out. :rolleyes: