Was the car running when this occurred? If an intake or head gasket is the problem, the car would smoke like a crop duster and the exhaust would have an antifreeze/insecticide smell to it. Even with the slightest leak, the smell is unmistakable even when it just looks like light condensation coming out the exhaust after startup.
With no visible leak and no odor when running, the leak is water pump to timing cover to block related. Did your builder reuse a rusted separator plate between the pump and timing cover? It only takes a few pinholes to let coolant into the oil pan.
An intake gasket leak will usually show itself with antifreeze in the valley pan. Head gaskets can leak internally into the bores. Between 4/6 and 3/5 are most susceptible spots for the head gaskets to fail.
I would pick up a cheap borescope from Harbor and check the cylinder bores for antifreeze before yanking the heads.
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Triple Black 1971 GTO
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