I've got a Poulan 42cc converted to gas/glow with a Walbro 11.11mm carb. I would like to replace it with a 13.5mm carb? Would any of the Walbro WA or WT series carbs with 13.5mm venturi and High and Low needles be OK? I'd like to go ahead and get one off the auction site that's been mentioned here recently. I'd like for it to have a primer bulb too, but that's not mandatory. Thanks.