My carburetor keeps dumping gas

My carburetor keeps dumping gas when it conks out. I have a 360 engine with a holly carburetor. I can hear the gas. Is this a carburetor issue or could this be a timing issue? And it doesn’t seem to idle right. Even when I put that idle screw in or out. Let me know what I can do. I also have a different holly carburetor I can try if nothing works. Let me know your thoughts. Thanks

These are my thoughts;
1) When it conks out, get out and open the hood as fast as you can; if you can hear "sizzling" right away, then pop the air cleaner off and look for "smoke coming up out of the intake, and a strong smell of gas..
If all 4 of these events are happening simultaneously, then one or both of your float valves is not shutting off. Then You get to figure out why.

2) but if the sizzling doesn't come until later, then you have at least two problems; namely the one that caused the engine to conk out, and the second is causing fuel percolation.