Car Quits At Speed :( stressed

I asked similar questions last week.
I changed plugs / wires. Cap rotor is fine. Cleaned carb.
The car runs and starts great. Tonight on the way home on the freeway at 50mph the car just stops. Like the key was turned of. Tried to start. No luck. Pulled over waited. Started and ran great. About a hour later , the same thing at a stop light.
I need this car for my pregnant gf. Please help.
Ignition switch in column? Ign box ? Carb? Coil? Switch in pic ?
Any direction wound be great.

72 Plymouth scamp
318 2 brl carb
Stock electronic ignition
Automatic

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