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Cars have had watercooling to the intake manifold, at least since the 1960s. Before that they used exhaust manifold heat at least back to the first flathead ford in 1932. They also preheated the air going into the carburetor.
In the Z20-24 NAPZ 4 cylinder nissan engine used in the 200sx, just before fuel injection was introduced in the D21 "hardbody" in 1987, they even had a heated electrical mesh in the throat of the carburetor to provide additional heat to the incoming air-fuel mix.
Venturis in carbs create higher velocity which means potential "icing" in carbs. Disconnect the additional heat sources and the car-truck was undriveable. My 63 Valients (slant 6) all had the intake connected to the exhaust with a heated bimetallic spring controlled flap that restricted the exhaust flow when cold, combined with a preheat system to the air cleaner to prevent icing.
regards
mech
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