Hotter Spark Plugs

Can l go to a hotter plug if my plugs are all blackened.
Probably not because they are a heat range too cold. Possibly choke staying on, carb bleeding over due to too much fuel pressure or a bad needle and seat and/or float with a hole in it. Holley carbs with a blown power valve can run rich as well. A slim chance you could have a bad coil. Slim possibility.