Carburetor Float valves

[TJMack]

Would I be more apt to get a valve that doesn't leak if I tried a Grose style float valve instead of the Viton tipped ones? I've gotten two of the Viton ones from Mike's A Fordable Parts and they both leak worse than the one I'm trying to replace. That one will occasionally stop leaking, but the new ones both would let the carb drip continuously.