Just starting 496 build for a mud bog truck. Goal is go out of 200 ft. pit and be judged on the best time. But some pits are dug deep and winner is based on distance. With this in mind, what fill should I use? Half or full? I may sit in deep mud at 5000 rpms for a couple of minutes trying to go the extra foot. Will a full fill hurt the cooling of the motor when I "churn it up"?