i am about to start a new build-up for my mud truck and here is my dillema. i have 4.250 bbc crank and both tall and short deck blocks. since i have to buy pistons and rods, which block should i start with. bottom end torque is important but rpm is also needed (6500 rpm would be great) i realize the tall deck is a more expensive build but cost is not the real issue here, i'm after both power and durability. any help or suggestions would be appreciated.