Which engine is Cooler?

By the sound of what yer plannin, My vote is fer the Hemi,...kinda goes with the theme of the truck for today's times, being lowered and all,....

440's been done about a gazillion times, (just how many zero's iz that anyways???)

You can still get v10 donor trucks faily reasonable, but for DD use, why not go for something recently made, and parts plentiful.