[dmsfrr]

Depending on which carb and choke mechanism you have there is usually a separate adjustment screw on a 'fast idle cam' just below or behind the choke thermostat cover. Maybe not as easy to see as the one in the red circle in this first example photo.

I wired the electric choke to the 12v side of the ballast resistor in my 12v converted '55.
Example photos 2 and 3.
Your 302 may have a Pink resistance wire instead of a ceramic ballast resistor. That Pink wire may be under the dash not in the engine compartment so double check voltage at the coil.
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