They allow your choke to function properly. One provides filtered air to the exhaust to be heated by the manifold, other delivers the heated clean air to the choke spring. If you go with a manual or electric choke, you do not need them. If you elect to not reinstall them, you should convert the choke to one of the above. Most auto parts stores sell the generic choke tube kit in the Help section. There might be enough tubing in it to make it over the tall covers.