i do not believe you have a ddec. like ron said, it will mechanically shut down based on temperature sensors and not by the ddec before they were installed. which i think started in 89 or 90. but, anything is possible.
if for some chance you have one, it is a silver box on top of the engine toward the radiator if i remember on the passenger side on mine. it has a bunch of wires going to it. the box i think is about the size of a good sized rectangular fist.
another indicator would be a ddec diagnostic plug under the dash to the right side of the steering wheel. on mine it is a flat plug. that is where i plug my scanner into.
good luck
tom
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