HP Per ci

[headcase]

Hi

I was wondering about fuel consumption and other factors after looking at different engine ci - power possibilities.

Eg:

2 identical cars, both at 650hp.

Car 1: 428ci (stroked 351 small block) = 1.5 hp per ci.
Car 2: 360ci ---------------------------- = 1.8 hp per ci.

Which of the 2 will be a more efficient engine in terms of street cruising and which would be more efficient under wide open throttle (racing)?

Which would have better acceleration (flatter torque curve)?