That's pretty chilly I definitely got carb icing in those temps... not fun when trying to catch an early-morning flight out of DIA an hour away and decided to drive the Duster because it's faster lol
The proper solution is getting warm air to the carb but to do that you'd have to rig up a system like the factory did in the '70s and '80s having the diverter valve in the air cleaner with the heat riser pipe off the exhaust manifold. I ran a setup like that with headers, just cut up an old manifold heat shield/riser thing and used stainless steel zip-ties to attach it to one of the header tubes. I never got around to it but I always wanted to run the vacuum lines into the car so I could switch the valve on command, I had it where I had to get out of the car and lift the hood to disconnect the line.
