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Similar here - also on a Camaro (70 1/2). Turned out to be the wire that grounded the base plate on the points. Would come and go depending on advance and temperature. Similarity here is that it was same symptoms as above - immediate engine stop like someone turned off the key - tach would plummet. Would crank but no tach movement. All symptoms of no power on primary (low voltage) side of the ignition circuit. Look at ECU power and ground, and ignition switch run position circuit, and coil/coil wire connection.
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