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What size engine? I'm sure you slap a big'ole blower in top of it and delevope that kind of horse power. Hell, if you through enough money at the sky is the limit to what you can do.
So you could start by giving everyone here your budget, what sort of use the truck is going to see, what work (if any) has already been done, etc, etc...
Also, are you talking 400 HP at the flywheel or the rear wheels?
One thing I CAN guarentee is that it either WON'T be cheap!!
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