sure, there is hp and torque (same thing, right?)
and the second thing people think about is the wt. of that heavy slug that will be sitting somewhere along the axis of the car
but, there is also the
size of the engine -- packaging is an issue in every car
so, here is a thread on engine size - to celebrate the new (C7) 'vette (which oddly still has its engine in the front), I'll start with the small block Chevy motor: