Car dies in "run" position

BillGrissom said

Sometime around 1974, a seat-belt interlock was part of the ignition and/or starting circuit. It causes many "won't start" issues. Even more than the ignition switch, I would suspect the bulkhead connector since they have many issues (melting, corrosion).

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The only thing the interlock causes is "no crank." This is easily bypassed at the reset box under the hood. There are two yellow / yellow tracer wires which are the start relay "start" wire. All you need do is permanently splice them together. I intended to mention this, but should not be part of this immediate problem