I have an 87 caprice with a 350 engine, with an eldelbrock carburetor. How do i adjust carburetor?

The two screws on the front are for setting the idle fuel flow. If the engine and carb are in good shape and no vacuum leaks present, these should be open to about 2 and a half to 3 turns. Close one until the engine starts to run a little rough then open until smooth, then add another half turn. Repeat with the other side. A vacuum gauge is a very helpful tool for doing this. Adjust the idle mixture screws to peak vacuum and about a half turn to keep the exhaust temperature down. The screw on the throttle linkage is for setting the idle. There may be a High idle screw on the linkage also. This has to be set with the engine cold and the choke on. If it is an electric choke, loosen the screws on the choke thermal spring (round w/ a black cover on the side) and rotate the cap to set the choke carburetor's choke should be set with a gauge, but a match book's thickness will get you close. Tighten the screws. Set the high idle. If you want to adjust the carburetor's mixture above idle, you have to take it apart and change the jets. They are numbered by size.