Mild 383 build

Proof?

First one is common sense. Like I said, if a big piston had more force on it, nobody would use...or design..... an engine that had smaller bore/longer stroke. Particularly where efficiency & economy are important such as commercial vehicle engines....which use long stroke engines.

At short notice......
Get a wet, soft grain of rice & put in on a table. Put a house brick on the grain, end on, & the grain is crushed. Spread wet rice over the table the area of the brick. Put the brick on the rice; the rice might compress but it won't be crushed because the same force [ weight of the brick ] is used in both cases, but concentrating the same weight [force ] over a smaller area produces higher pounds/ per area.

The longer v shorter stroke only looks at mechanical advantage. Not air flow. At lower rpms, a short rod moves away from TDC more abruptly than a long rod engine. This generates more vacuum in the cyl, vacuum being the medium at lower rpms that draws air into the cyl.
At higher rpms where you start to get some ram/inertial tuning, this abruptness can affect flow into the cyl, so the long rod is better.