Cheap best mods for family compititon

So I'm a 17 year old girl who knows nothing about cars but my crazy family is wanting to do a compititon. Each person has 500 dollars to buy and modify a car then we will take them up in the deep woods and do a bunch of stuff like who's is fastest who's can climb over logs the best etc. They bought me a 300$ 1998 ford f150 v6 bUT only 2wd. It runs alright and has no papers that's why only 300$. I now have 200$ to spend on making it better in any way. I want to increase torque and horspower any advice on how? I've looked up videos of do it yourself cold air intakes for about 60$. Any ideas or advice would be greatly appreciated!!! :)