First time motor pull

Um, run it up? Before the tranny is on? Plz explain how that can be done on a Mopar. Even a stick car needs at least the bellhouse on to mount the starter. And then, whats holding the back of the motor up, so the fan doesnt eat the rad? Or the firewall wrecks the dizzy?And it would be real stressful on the mounts.
-Or did i misunderstand "run it up "?
-Only 4 bolts hold the hood on.
-You must be a newbie.