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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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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