Will a motor from 2002 crown Victoria fit in 1989 mercury marquis?

No, a 2002 Crown Victoria motor will almost certainly not fit in a 1989 Mercury Marquis. The engine bays, mounting points, and ancillary systems (wiring, cooling, etc.) are drastically different between those two model years and platforms. The 1989 Marquis is a much older design. Even if you could *physically* cram the engine in, connecting everything else would be a monumental and likely impossible task.