Like CanuckRT said, the 5.9 wasn't available in '97, so it would seem that the previous owner swapped it. If that's the case, they could have used the 380hp crate 360, which would definitely account for the increased performance. What is the 8th digit of your VIN? That's the engine code, if it came with the 5.9 from the factory that would be a Z. I've seen the teal green color you have before, but only on a couple of trucks, I agree, it's an ugly color, but that's personal preference of course. 3200lbs sounds really light, even for a sport, but I guess it's possible if it was stripped down pretty good. Is it an auto or 5speed? You should take it to the track and see what she can do