If you want to test carburetors for your race car then grab this adapter.

Comes with a 3D printed stand off and 1/4” aluminum plate.

The stand off adapts to the flow bench and lifts the carb up off the deck for clearance.

Use the 1/4” plate to mount your carb. The plate is a blank and you will need to transfer punch the hole mounts and cut an opening for the air to pas through. I used a gasket to help me mark out the hole locations. If you don’t have a gasket then some grease on the carb will do the trick. Apply some blue, red, or black grease to the bottom of the carb and then set it on the plate. Be carful not to slide the carb. Remove it and now you have a clear mark of where the holes and openings need to be.

If your carb is like my Holley 4150 then the throttle linkage will hit the adapter plate. So I got a spacer off the internet and that solved the problem.