Ran fine last night, wouldn't start this morning

Tried starting the car this morning after driving all day yesterday and had no luck.

The lights and radio come on, car cranks, gas flows into the carburetor, but car doesn't fire. It was raining last night, but the car had no problem starting then.

It could be a spark issue, but because it was running less than 24 hours ago I don't see how it sitting overnight would keep it from turning over.

Any help would be incredibly appreciated. Engine is a 74 225 /6 in a 65 barracuda, electric ignition and electric fan.