How does cid make power?

Most the V8 builds you look at use similar parts to archive a certain hp eg.. 500 hp
Don't matter if your talking a 289 Ford, 350 Chev or a 440 Mopar etc... Not like the 289 gonna need a 100 cfm more head flow and 80 degrees more cam etc.. Than a 440 for same power. But yes the powerbands are gonna be very different.