383 won't start. It cranks, I have spark & fuel - could it be the battery

1967CudaMan said

So even if the engine is cranking fine it still could be the battery?

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Yep it takes very little voltage through the ignition switch to close the starter relay and send lots of battery power to the starter. When you don't have enough voltage to hold that relay closed ( click click click ) every click is the starter taking away the power that was holding the relay closed briefly.
At the beginning you said you had spark. A weak spark wont start it as explained above. And that was the case back when we had real gasoline. Even more true today and here where fuel quality is questionable. I can't know if you already have spark plugs soaked in aged pizz poor fuel.
good fuel + good hot spark = varoom LOL
ignition 1 is a blue wire, hot in start, and found on the ballast resistor. Use a volt meter to see if you have 12 volts there during start.