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If you are still researching this swap, check this site out: http://www.maliburacing.com/forum/ Should be plenty of threads to read, don't know...
I don't know much about those years, but most cars had a central dash mounted speaker. Maybe the door speaker was for stereo? Or added later.
http://charlotte.craigslist.org/ctd/1555659233.html Nice wagon. Non original powertrain. Steep price.