Edelbrock 1406 Not Pulling Fuel into Carb

Bewy said

[1] Remove fuel line at the carb & crank the engine. Make sure fuel comes out of the line. If ok...
[2]. Remove air horn. If using E fuel, is it causing the rubber tipped needles to jam? Check that out.
[3] Remove air horn. Invert air horn. Suck on fuel inlet. You should not be able to suck air. Turn air horn over so that floats hang down. Suck on fuel inlet & you should be able to suck air. If not, needle are jamming in their seats. Could be wrong needles or tight.
[4] Many original Carter AFB/AVS carbs came with n & s kits that contained a small spring; the spring hooked around the neck of the needle & the float tang; when the float dropped, it pulled the needle out of the seat so that fuel could flow.

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There is plenty of flow, new fuel pump and fuel filters last fall. I have only just started using non-ethanol gas, maybe has one hour of running time on it. The carb has been professionally rebuilt, and then taken back and gone over again after the problems continued with no improvement at all. It has not run after the last teardown as I did not bother to prime it and run it as it is a waste of time at this point as it would not work like a normally functioning carb, so it is absolutely clean right now. I put the stock Thermoquad carb back on yesterday after the Edelbrock would not inject any fuel into the carb throat and start, as usual, although it runs like normal after getting started after a prime to get it running. With the Thermoquad the 440 starts as one would expect, and runs well. Something went awry in the Edelbrock all of a sudden, and having been disassembled twice the problem continues. Has to be one odd thing going on with it.