Yes, his carb needs to be reworked. It is a 3 circuit Holley that hasn't been modified and the intermediate circuit floods the engine at certain throttle positions. Evidently it runs okay from him at the track because of his two step and then being WOT down the track, but it was super rich on the dyno when we were trying to start the pulls. But the engine showed some signs of being run rich so we told him to either buy a two circuit, or to get someone to rework his carb.
The dyno carb is a box stock Holley 1050 XP. It works great on every engine we use it on. Usually don't even need to change jets in it.