Is there any dark gray or black smoke from the exhaust? That would indicate flooding. Also, have you checked to make sure the choke is fully open when the engine is at operating temperature?
On these carbs, there is a thermostat that opens/closes the choke based on engine temperature. Also, there is a vacuum break that pulls the choke open. The vacuum hose to it must be attached to what is called, ported vacuum. In other words, it must be attached to the base of the carb and not directly to the intake.
If this hose is damaged or not connected, that could be the cause of it running rich. Check that hose. Also, if the hose is good, then you should get a handheld vacuum pump to confirm the diaphragm is holding a vacuum and is not faulty.
I attached a pic below showing what I'm referring to.
Let me know if this helps.
See pic below.
Sunday, June 19th, 2022 AT 9:24 PM