I have worked on a lot of Holley carbs. The float needle rarely sticks closed and mostly start to leak when needing a rebuild. I have rebuilt plenty of them.
You aren't getting fuel. Holley recommends 7psi at idle and 4psi at redline.
Disconnect the fuel line, put it in a bucket, and see if you have flow. You can also take the sight screw out of the float bowl cover and see if there is fuel in the bowl, which I bet, there is not.
Also, the accelerator pump nozzle would squirt as you manipulate the throttle lever/plates. No squirt, the bowl is empty, or the accelerator pump isn't working. All of these carb parts and seals to make these things work will be in the carb kit.
Rebuilding the carb is a good place to start, but make sure you have fuel flow, clean fuel lines, and a fresh fuel filter.
I keep a spare electric fuel pump on my shelf to hook up to a gallon can of gas, just to get old cars running and eliminate any issue of bad fuel or lines.
Just for giggles, here is the last Holley I will ever run, a Braswell modified Holley double pumper on a NASCAR spec engine:
All I own now are AVS series Edelbrock carbs.