Hitting the track, but which car to take?

My brother and I are hitting Rock Falls Raceway this Sunday. I want to take my Dart so I can have printed evidence that his Warlock can't take my Dart. I street raced him three times and beat him each time, but he insists he won the third race. I want it on paper with a shitload of witnesses. However, I have been dealing with a transmission leak that I thought was temperature related, but I now know is not. It only happened at high speeds or when I manually shifted and drove hard, and it leaks from the vent tube. The last three times I drove it, it didn't leak. I'm going to beat it up tonight and if it stays dry I'm taking it to the track. If it leaks (and it probably will), I am taking my SRT8 and will see what it can do. I just did the performance tune on it last night, so it should be somewhere near 450 hp. Kind of excited either way. I might be able to beat the Warlock once he runs out of nitrous.