3951509 is the casting #
I don't think its high at all considering the cam and lifters etc.
That motor needs nothing.. bolt some heads on and go pretty much. It is a 406 already though, brand new oil pan gasket and RMS. It had great compression when I tested it too. If you have any questions feel free to ask.
I would be happy getting 1000 for it plus im sure I've got some extra parts for it.
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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