I think I need to go to Carter BBD Skool !

The 2 NOS BBDs I bought last year were still in the factory plastic wrap.
I have used 1 so far and it was absolutely fantastic
I have the 2nd one out of the plastic and on the engine it will be used on but not yet bolted down or linkage hooked up either.
There was a guy on the /6 site that had like 10 of these a little bit over a year ago and sold them out quickly. Not chunesium reproduction but actual honest to goodness brand new Carter BBDs from around 1978. All were carb number 6537, which comes back as a 318 application from 76-78-ish 318 "HD truck" application (back then "HD emissions" basically meant "no" emissions gizmos besides a PCV valve.