Mark Rosenbaum
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As you note, this is probably an electrical problem. In the whole car, about the only things temperature dependent are the sensor for the temp gauge, and the temp compensators on the carburetors (assuming Strombergs), and neither of these is likely to be able to cause the engine to shut down instantly.
I suggest examining the various wiring connectors between the distributor and the ignition switch. Probably you'll find either a corroded pin or socket, a broken wire that just happens to be making contact with its connector, or something similar. If that doesn't help, check the points gap (assuming points), the flex wire (points to coil terminal) inside the distributor (again assuming points), and the ground wire between fixed and moving plates. If that doesn't help, try substituting the ignition coil.
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