Perhaps a vacuum leak?? Take some carb cleaner and spray it around the intake ports, carb base, and see if the idle changes doing that. Its the first thing I'd do. May as well check the wiper vacuum line for a leak to?

1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
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1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile