Looks like an awesome piece for the right person. Not disputing that it may be NOS but I have a few observations. Have never seen brass expansion plugs that were factory installed. Is there some type of balancing work that has been performed on the crankshaft (rear counterweight)? Most NOS and many original SD/RA engines have pink/magenta paint splotches on the main caps.
Great find regardless though. Good luck with the sale.
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