If running similar cylinder heads 340 will breath slightly better (rpm) and 360 will make slightly more torque and less rpm generally, torque and rpm are the yin and yang of horsepower, RPM is like Rodney Dangerfield.
Have you not yet learned that rpm is valve train regulated issue?
If you can’t control the valves, you can’t rpm.
True the bigger bore breaths better.
You put in parentheses, rpm. This is also not the end all nor the beginning. Excellent breathing starts way way way before rpm. So including that alone is mis information and mis leading.