84's are fairly easy to do. You need a delay wiper switch (goes in the steering column-kind of a pain to change), a turn signal/wiper stalk for delay wipers, and an electronic box (delay module) that plugs into the existing wire harness under the dash just to the right of the steering column. The wiper motors on the 84's are the same for delay and non-delay wipers. Sometime after the 84 model year, GM changed the design of the wiper system and the wiper motors are different. They also eliminated the delay module and put the electronics in the wiper motor housing, so I don't know how easy they would be to change.
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Rod Schneider, Woodstock, Ga. 84 SE, 330,000 miles and counting, 88 GT, not nearly as many miles :)
