New Engine Still Overheating During Break-in

Sounds like your carb is flooded from messing with the adjustments..

set the adjustments properly, let it sit a bit and try starting again.

As for the over heating .....it sounds like you are air locked.

I always suggest installing a "flush T" in one of your heater core lines.

What doing this does is bring a closable vent to the top side of the cooling system so you can open the vent and " burp " the air out of the system as the temperature raises and you can add more water/coolant to the radiator.

what I normally do ( If the vehicle does not have flush T ) is open the radiator cap....pour my fluids in...start the car......hold the throttle at about 2,000 rpm which sucks all the air and gets it circulating .....and with the radiator cap open any of the air circulating in the stem will pass through the radiator and exit.....keep checking to make sure to add more coolant/water when needed.

sounds like a simple fix, don't beat your self up over it