72 Duster, Ethanol gas, intake backfire

Here is another symptom that I forgot to mention.
It may be unrelated or possibly a different problem but even though there is a healthy accelerator pump shot, the car is very hard to start. I had to spray carb cleaner down the throat to get it to fire. I did this several times.
Igniting the spark early can make it difficult to start & igniting spark early can cause backfire.