Greetings,
The "box in the trunk "that you are talking about is for the sequential turn signals.
Not sure if the 1964 model had them. If they did, then I would look for what looks like a taped up UPS package in the back of the trunk. (Right in front of the tire, looking forward) But before that, check your fuses. If the fuses look ok, then I would check that "package" you have in your trunk for a bad connection or loose wires, etc....(if you have sequential turn signals)
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