the calibration of the older maf's was generic. all you should have to do is unplug the battery for a few mins so the computer loses it's memory then start back up with the new MAF in place and it shoudl be able to read it fine.
if you still have a problem i would suggest looking around the wiring to see if anything shows signs of damage, old brittle wires can get little slices and crap in them pretty easy.
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