FE's are good, but doubt they'll keep up with blown or nitrous assisted big blocks!!!!! The Edelbrock heads are quite good for what they cost...but can't hold a candle to the Blue Thunder's on performance....Guess it comes down to how much power you can afford....... Not into the mudder and puller stuff at all, but it's going to need all the parts and components that will build the torque!!!!! Big horsepower and rpm would probably just spin the tires. As with any form of motor sports, it's going to take a well thought out and planned build of the entire truck, not just the engine... Just like drag racing or circle burners, if you can't hook up, doesn't matter how much power you have the combination is wrong and it just ain't gonna work!!!!! A properly set up chassis with the right gearing and tires with a modest engine will invariably win more races then the big horse, stock chassis stuff!!!!!!