The first and the basic thing are to first Locate the carburetor. The carburetor is usually placed on top of the engine, in the central part and beneath the air cleaner. Switch of the car a give it sometime to ensure that the engine is cool to avoid the risk of burns. Remove the air cleaner assembly. Most air cleaner assemblies on carburetor-equipped car use a single wing-nut, located at the top of the assembly, to hold the assembly to the carburetor. Remove the wing nut by twisting it in a clockwise direction, and then lift the air cleaner assembly away from the top of the carburetor. Some vehicles produced in the earlier year's uses a number of clips to fasten the air cleaner into place, which must first be removed before the assembly can be lifted away. The clips can by pried off with a flathead screwdriver.
Disconnect the throttle linkage from the carburetor. The throttle linkage is located on the driver's side of the carburetor. A linkage is attached to the carburetor with a single clip, which can be removed by pulling it off with a pair of pliers. Some linkages connect to the carburetor with a single screw, which will have to be unfastened using a screwdriver. Remove the four nuts which hold the carburetor to the top of the engine with a wrench. The four nuts are located in the four corners of the carburetor.
Lift the carburetor up and over the four mounting studs. A lot of care must be taken when lifting the carburetor up to avoid disturbing the various hoses that are attached to the carburetor. The carburetor need only be lifted up enough to access the gasket which sits between the carburetor and the intake manifold. Remove the carburetor's gasket. If the gasket is not present on the face of the intake manifold, the gasket must have been worn out and peeled off from bottom of the carburetor.
Slide a new carburetor gasket over the four mounting studs on the intake manifold. A gasket should not be enhanced to stick by using adhesive substances like a gasket sealer or silicone, as it is self-sealing. Lower the carburetor over the four mounting studs and onto the new carburetor gasket. Secure the carburetor into place by installing each of the four nuts onto each mounting stud, then by tightening each nut with a wrench.
Reconnect the throttle assembly to the side of the carburetor with the assembly's clip or retaining screw. Place the air cleaner assembly over the top of the carburetor and secure the assembly into place with the assembly's wing nut or clips to complete the repair. Sometimes the car will smoke after it is started. This is harmless. Repeat the procedure if you car does not start. If you cannot locate the carburetor, you probably are using a vehicle that uses a fuel injection engine.