in a perfect world they'd combine huge displacement with high revs, enabling the 8.4l V10 to produce something between 105hp and 110hp per litre...that's beetween 882hp or 924 hp
.
that would probably mean bye bye to the pushrod system, and certain death as standard.
realistically speaking i think ferrari will tickle the engine a little for an extra 40 to 100hp, and probably include other stuff like direct fuel injection and magnetic dampers.