I don't, yet. Waiting on delivery of this.
Key to know: there is a difference between the vacuum advance takeoff on a carb—which if you're running IDFs is that long post with the screw in it facing outboard—and the manifold vacuum required for the Black Box's MAP [Manifold Absolute Pressure] sensor. Those are tiny screws on the bottom of the carb and there's no simple way to get them hooked to vacuum lines.
The port circled in red should work with the Magnaspark. T them together from both carbs and rock on. Those little screws inboard of the idle mixture screws need weird M5 threads. Those ports are completely below the throttle plates. That's what you need for MAP to work right.
The $50 CP Performance kit obviates the need to either
A. drill out those little screws and solder or epoxy some tubes to them; or
B. drill small holes in the manifolds and solder or epoxy tubes to them.
For me it was a close call. If I had an extra set of those little vacuum port screws I'd have gotten after it with the drill.