Carb adjustment

Yes Ax, they (the idle speed screws) should all be about the same. There should be a secondary idle speed screw under the carb body too. Technically, when you adjust your idle speed with the primary idle speed screw, holley says that the secondary plates must be opened the same amount but the screw is under the carb and almost impossible to get at without removing the carb!

That's why I build my carbs with a Quick Fuel baseplate 'cause the secondary idle screw is placed on top right where you can get to it. They're (the secondary idle speed screw) most likely fine where the factory left it so I wouldn't worry too much about it unless your having some really bad idle problems (read: Giant Cam, lol!).

Have fun! :)