Yes, a 2 circuit conversion moves the air bleed position to the middle, and the outer gets plugged to keep trash out. On a 3 circuit carb removing the air bleed leans the intermediate circuit some, the intermediate circuit adds way too much fuel at part throttle and is part of the issue. If you looked at the original old style 9375 carbs it came with no bleeds pressed in the body for the intermediate circuit. It was one of the best 3 circuit calibrations Holley had, even still most will run much cleaner, better, and more consistent with a properly calibrated 2 circuit Dominator. We've had them on engines from 500 HP to well over 1000 and never an issue with losing the intermediate fuel. The only thing you have to watch for is if you try to plug the intermediate jet on factory blocks you can run into an issue getting enough fuel through the main well, usually somewhere at or just over 900 HP or sooner if using oxygenated fuel. This is why we use a 2 circuit block or a BLP 3 circuit wide body block, they have no idle feed tubes in the mainwells to cause a restriction.