Any carb can have icing issues. But there is a very little surface area where direct intake/exhaust is made... then add to that an insulating gasket and most heat will be from radiation, not a very effective way to heat the base. Plus carb ice occurs in the venturi, not the intake.
My two 43's (GMC and Chevvy) have a governor, on top of a 1/2inch insulator, which sits on the intake. Not a lot of heat going to get that far up.
A lot of 40's trucks have that setup.
