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Worked great and made power on the dyno,would NOT work on the car. They will be going back.

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Not trying to enjoy your misfortune, but I always have to laugh at this comment. Comparing dyno results to what the carb/engine sees in the car is apples to oranges. There is no acceleration (movement), so there is no fuel being pushed to the rear of the fuel chambers to affect tuning, etc. The airflow that the carb/engine sees in the car, especially with a scoop/air pan is totally different, again affecting tuning. And since the rate of (RPM) acceleration on the dyno is typically much slower than the engine sees in first and sometimes second gears, some setups like 6-packs that rely on vacuum secondaries opening can be heroes on the dyno and a boggy, lazy POS on the track/street, due to not being able to get the secondaries in fast enough.

It boils down to while the tuner carbs can fix a lot of the fundamentals in a carb and make it easier to tune with screw in air bleeds, replaceable boosters, etc., you are very lucky to just drop on any carb OOTB and have it perform flawlessly.