id get a new carb gasket and retighten it. sounds like a vacuum leak. i would say the fast idle was affected by the choke removable but if it idles fine in drive i would still lean towards the carb base leaking.. let the motor cool down and spray a small bit of b12 around the base. see if the idle changes. if it does theres a leak..
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'69 Camaro- Daily Driver
'70 Chevelle- Project
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