Are you talking about the mixture scres near the base that you can thread in and out? With your urgency, I would try one out of any Rochester carb, even a 2 bbl or 4 bbl if you or a friend has one around. Or if you have an ignition specialty shop in your area they might have an older carb laying around that you can scavenge it out. I have some earlier single barrel carbs that ou can have for the cost of shipping but that won't help you tonite.
