I think I need to go to Carter BBD Skool !

Replace the carburetor with something that uses the Holley 2300 bolt pattern. Then you can actually adjust the carburetor to match your components. The BBD was a great carburetor, 50 years ago. Not so much now.
Boy do I have a lot of frustration to go to get my money's worth out of what I have in this carb. The messiest part of this carb conversion has been paying through the nose for the pleasure of working with a NOS carb and then having a local shop modify the throttle shaft to accept the original '64 Dart throttle linkage. Yeah, waaaay down the rabbit hole.:eek: