Get you a 4mill crank that drops right into the stock cases since you don't have to trench them out. Maybe get a nice dune port with some wiseco pistons noss cool head and some PWK's. You said you didn't want to drop a crank in but if your wanting it to scare the shit out of you and perform like you explained then your wasting your time doin all that other stuff without a good crank. That's my opinion if i was wanting to build something. Jamey (RIPPEN) on here can tell you the best settup to go with cause that's all he does is trail, hill, and some drag. He has a 4mill that rips