What value should I enter for BARO? And on what basis exactly?
If I’m understanding the question correctly, the barometric minimum is 1400 feet. The second number is the AGL (above ground level) height, or what you would see/set on a radio altimeter.
From those numbers I would guess the airport sits at 325 feet MSL? That should also be shown on the chart, and those numbers should always “add up” in my experience.