Another option to correct warping is to get a 1/2" thick piece of steel plate and drill and tap mating holes to the upper half of the carb body. Screw this to the plate and put it in the oven. (obviously you have removed all gas and rinsed first)
Fire at 300 degrees for an hour and it will come out flat. Use proper torque when re-assembling and it will not warp again.
