One of my favorite quotes: "There's no replacement for displacement"

Start with maximum cubes and the rest will follow. Should be more reliable torque and power in a bigger motor.

At these 400+ ci, I would opt for a big block over the small block, but that's just my preference.... two ways to make big power: big torque, and big rpms. Start with big torque and you'll spend less time fixing grenaded motors (and more time fixing grenaded trannys, rears, and axles)

two cents,

Chris