HELP!!! COOLANT WATERFALL!!

The other hole is a none issue, at the choke house, that plate has been retained with just one bolt hole since the early 70s, and now serves just as a locator.
The rear of the intake is dry, the water stops when it hits the intake. You can drill thru the bottom of those holes and just find air; no water there.

If water came out that hole beside the carb where the choke plate sits,or if it came out any hole on the intake, besides the T-stat holes which occasionally go into the water jacket,or the sensor holes;then it came from inside the plenum, and something is seriously wrong with your new head.... or the install.
I agree that the intake may not have been sealed to the head and water trickled into the plenum from one or more intake ports.

To get that head onto the dowel properly, with the intake still on, wouldda probably taken a fair bit of force, and I dunno how the intake gasket would have endured that, so I vote take the intake off. You might as well clean out the EGR chamber while it's off. You gotta seal the corners with RTV anyway.

Flip the head over and check the deck at the dowel hole. If you put 85/95# on those bolts with the dowel hole not on the dowel, you'll see the damage.