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OK, so you had the carburetor apart a few times. You mentioned using some sort of sealer on those intake gaskets, which may cause an issue, those gaskets should be installed “dry”. The two intake gaskets are different, and can not be mixed up. There will be an internal air leak if the gasket meant for the front of the reed plate is used on the back (crankcase side). So, you may want to order two new gaskets (remember they have different part numbers), clean the reed plate of all sealer, and replace those gaskets.
So, you are saying that gas/oil is getting into the carburetor bowl, but the carb doesn’t seem to be able to deliver it to the engine. Perhaps you don’t have the needle valves set to their proper positions.
The high speed needle (lower one), should be backed out 3/4 turn after being gently seated. The low speed needle (upper one) should be backed out about 1.5 turns after being gently seated. You mentioned replacing the float, did you replace the inlet needle/seat as well? Sometimes those inlet needles get stuck and don’t open properly. Did you use OEM carb parts, or aftermarket? Oftentimes that aftermarket stuff doesn’t fit properly jamming the float so it doesn’t move freely inside the carburetor. Once again, you have confirmed that fuel is flowing into the carburetor bowl??