"There used to be a guy in Augusta, GA, Merv Harden, that sold these chokes on e-bay, that's where I was able to get mine." Uhm, lets try this again...the choke you want based on your pics and description is the one I described in an earlier reply. Instead of having a Carter part # on the dome it says Holley and has a different style rod to accomidate the Holley carb.
Your carb spacing looks fine.