It was not a WT-456 that I have, and I will have to check the number, but, I have a walbro with large venturi, choke and maybe a fuel pump return spring, but, it has metal plugs over/instead of low and power needles. Can they be removed and are there needles under them? I have other carbs with just a low needle and a undrilled cored partial hole where the high needle would be. I understand they cannot be drilled and tapped for a needle. TIA