So your engine seems to crap out once the engine gets warmed up.

A vacuum leak can cause this. Check around the intake manifold, carburetor base and any vacuum lines attached. A vacuum leak can go away when the engine metal gets hot and expands.

When cold your choke valve is closed and the vacuum is pulling in extra fuel. As the valve opens there is less vacuum and the normal circuits take over. What this probably means is there is a lack of fuel with the valve open.Float level incorrectFloat drop not dropping enough, which will keep the needle from opening. Set to specifications. Don't fudge.Fuel pump pressure is lot. Test the pressure with a fuel pump pressure tester. Around 4 - 4.5 lbs will do it.A passage may be plugged. Especially the small passages such as the idle vent passage. Make sure you can blow through each passage. Include the small passages on the venturi. Simply soaking a carburetor in a cleaner will not unplug a passage. Dried gas leaves residue behind, which will plug small passages.

• Float level incorrect
• Float drop not dropping enough, which will keep the needle from opening. Set to specifications. Don't fudge.
• Fuel pump pressure is lot. Test the pressure with a fuel pump pressure tester. Around 4 - 4.5 lbs will do it.
• A passage may be plugged. Especially the small passages such as the idle vent passage. Make sure you can blow through each passage. Include the small passages on the venturi. Simply soaking a carburetor in a cleaner will not unplug a passage. Dried gas leaves residue behind, which will plug small passages.