Keep telling yourself that. Either the WS6 had some problems, a retard behind the wheel, or wasn't racing.
Your Crown Vic had a SOHC 4.6L, making MAYBE 190RWHP, but probably less than that. That same WS6 should have been making 250RWHP. Now take into account the WS6 was about 1000lbs less, and tell me which car won. BTW, I've been in a Police Interceptor balls out; they aren't all that fast. They handle fairly well for such a monster, though.