The first four digits denote the year, model of vehicle, and type of part.
D9 is 1979 model year, AE is full size model and engine.
6015 is Ford's part number for just about every engine they have produced since the 1950s.
ED21 denotes the actual part and how many times it has been changed.
This could be a 5th version 351Winsdor engine from a full size car.
The parts dept of any Ford dealer should be able to tell you for sure.
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