All the 3.9's from I believe 1990 and newer use the same Mass Air sensor, the Lucas 5AM. It may also be called a "Hot Wire" mass air sensor.
The later Bosche system has the 20AM meter, which is useable with some wire splicing.
My oil line fix
My 100k stopped odometer fix
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.