Sounds like you are not holding pressure. From the description provided I would be looking for loss of coolant. I seen several GM 4.3 v6's get a pin hole in a freeze plug. It goes straight to hot and boils over. And no I didn't see any coolant leaking. It was evaporating as it came out. Actually it didn�t start leaking out until it was under some pressure. As it heated up it would push coolant out the pin hole and the coolant around the head began to boil putting air in the system. Straight from cold to boiling over in less than ten minutes. Radiator never even got warm.
I would fill it up, start it but shut it off as soon as it hit the normal running temp. Do not let it boil over. Let it cool back down and check the level. If you loosing coolant it should show up in this test.
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