I would start telling the kid "why you always bring me junk?" tell him to make it look as good as yours and then you will race him. you could also consider the adage: "if you beat up a retard, what have you accomplished, and who are you going to tell?"
another thing to consider is that the 96 riv has the 4T60, and I am pretty sure it is not tunable, so with those things in mind, I would say you have a shot at winning the race. Also, according to wikipedia, the riv weighs just shy of 3800 lbs, and your GT should be around 3500, so 300 lbs give or take.
