Not reading all the posts because as well all know, all it needs is air, fuel and spark. Let's think a minute, your car won't run on its own. BUT if you manually add fuel to it (Ether) then it runs. I believe we have solved your mystery. You are missing fuel for some reason because when you add fuel it runs. It doesn't seem that complicated but like I said I did not read every post.
So, what is fuel related that can stop an engine from starting? low pressure for sure, bad injectors but it would have to be more than 2 bad, probably be 3 or 4 to keep it from even starting. A V8 will run on 6 cylinders for sure, maybe 5. It will start at least. Clogged filter/line maybe? I do not know the root cause but you figured out what the problem is already. How are you adding the Ether? is the intake tube unhooked and you are shooting it in the throttle body?
Again, can't be a ground because it RUNS when you add fuel. Either the fuel is not making it where it needs to be or the computer is turning the fuel down/off for some reason.
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