Those same parts were used on a lot of the Carbs from the late '80s American trucks.
Most had some sort of heater built into them.
I can tell you from experience that if you take one out (because it is cracked and making a vacuum leak) the truck will run worse,
so, it is easy fro me to see that it would help it to run better.
IMO find one from a reputable supplier with a heater built in and you should be on the money.
S.
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When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.
Albert Einstein
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