How does cid make power?

Not exactly, but close. The longer stroke MAY be capable of pulling more air, but if you don’t consider RPM (time) and if the architecture of the engine in question is capable of supporting an induction system to feed it.

In most cases, we are dealing with early 1960’s architecture and they were never designed for huge displacement and RPM.

yep..
Good example would be mountain motor pro stock engines compared to pro stock engines
500 cubes vs 900 cubes, but only about 3 tenths or thereabouts difference in the 1/4…..