1990 Cadillac Fleetwood engine type (HELLP!)

How can I tell by looking what type of engine is in a 1990 Cadillac Fleetwood I am considering bying?
Thank you very much.

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If this is a fwd Cadillac it is the 4.5 aluminum v8. If it is rear drive it is a 5.7 Chevy engine.

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