Hi Richie,
If you haven't already, you might check out this site for lots of information about Packard and the different models available.
http://www.packardclub.org/ I drive a '47 Custom Super Clipper. These models, along with the Super Clipper, came with Packard's "Super 8" 356 in. engine and it was carried through to '48 Customs and Supers. Pretty sure OD was standard on those cars.
I don't have the electromatic, but the OD is wonderful. Even with a very, very tired engine, 70 mph in OD was not a problem. (I say was, because the engine is out and rebuilt almost ready to go back in). Personally, I prefer not having the added complexity of the electromatic but some folks do.
Good luck with your search.
Mark
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