Frankly, I'm kinda surprised you won. Not because your car is slow, but because of how fast a fox body (or anything else rear wheel drive) can be with a turbo. It's not at all unreasonable to build a streetable single turbo v8 for 800 hp at the wheels.
In any case, none of that really matters-you wore his ass out. I bet he'll talk a little quieter next time.
I am hip to the power that can be made in those cars. My 25 y/o son has one making mucho HP. I know it takes the correct turbo, boost pressure, gas quality, intake, cams, computer tuning, exhaust, gearing, tranny, traction, cubic inches, etc.................... I say all of that to say this: I didn't speak to the folks in the car about their combo, nor did I get to see what they had. Coulda been a turbo V-6 for all I know. I am positive it was turbo charged because I could hear the high pitched whistling sound that a turbo makes when it is spooling up under a load. And I assumed it was a V8 because of the dual exhaust pipes and the exhaust note. Could have been a real bad a$$ with pump gas and the boost dialed down. I'll never know, but it was fun while it lasted........