How do you adjust timing on 1992 caprice 5.0?

it is the same as adjusting the timing on a small block Chevrolet. you will need a timing light and misc tools to perform this task. if you lack fundamental auto knowledge I recommend that you acquire a manual for this task. basically attach timing light, disable computer aided timing control, turn distributor until timing marks line up to specified range, tighten distributor bolt(s)