Is that a Zenith carb you have pictured??? If it is, the 1950 GMC Parts Book shows the choke cable bracket mounted to the carb top section over the choke plate rod. Screenshot of the upper carb in exploded diagram below.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)