Cold Start Issues

I guess, and I'm sure the older members do get tired of seeing the same questions asked time and time again. I apologize for tagging a jab.

I'm not an AVS guru, or a carb guru at all actually, but as stated above, I'm thinking you have no fuel.
It could be simply draining out down into the intake, or heat soak can cause it to percolate/evaporate out.
On a cold engine, I would pull the air cleaner and look for signs of raw fuel dribbling down the carb throat. Depress the throttle fully open, and ensure the choke is resetting properly. I read on the bottom side of the AVS there are some places they are known to leak once they have been rebuilt a few times. The heat soak issue can be resolved with a spacer. I've mostly tinkered with Holley's, but I would go through and set the carb back up from A-Z. Hopefully an AVS wizard will chime in.