I think I'm narrowing this down a little. Looks like my best bet is a 1966 series carb from a Mustang/Fairlane because it includes the kick down and linkage ball.
C6ZF-B
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66 289 Mustang, Fairlane (exc/TE) <-- not sure what that means
1.08 venturi 4V
Auto
480 CFM
C6ZF-E
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66 289 Mustang, Falcon(w/MT & TE) <-- again not sure what that means
1.08 venturi 4V
Auto
480 CFM
California Emission
So here's the kicker: Dad purchased this new in California does this mean I. So do I need to consider the Cal emissions into the equation? However this is not the original engine, it's a rebuilt 302. Transmission is a rebuilt as well. So does this negate Cal emissions from the equation? All of the smog has been removed.