Annular vs downleg boosters on carb

AndyF said

I've seen dyno tests where the annular boosters will add 50+ ft-lbs at part throttle over a downleg booster.

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Where at part throttle? 50+ ft-lbs sounds like a lot. Was it a case of just bolting the carbs on and seeing what the difference was or were both carbs set up correctly for an apples to apples comparison.