318 La with 360 heads

What I mean say your looking to build 500 hp street/strip engine your probably gonna use or port some heads that flow 300 ish cfm and add a 245 ish cam with enough lift to use most of the 300 ish cfm and have a cr around 10-11 to 1 with appropriate intake/exhaust.
No matter what displacement, obviously the fine details will very but that's the ballpark I don't care if were talking 273 or 440.

So..... you are saying the top end off the 560hp 416 will make 1.73hp/ci on 323 cubes.

In my actual experience...... where extremely similar motors were built(other than displacement) and dyno tested, the bigger motors made noticeably more power.

Since that’s how it usually plays out for me....... I’m just going to keep doing what I’m doing.