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Is your car a Canadian built '65 Chevelle also do you think this engine is the original?
Do you have any original paperwork or if a Canadian car, the GM Canada as built info?
I have a few Numerical Suffix listings but nothing 9X...is this stamped on the protruding frt. pass deck surface also are there more #'s there too?
1965 Canadian 327 Numerical Suffixes are usually #'s 25 or 85 but unlike US engines, the same Suffixes were used for multi applications w/ different heads/intakes/carbs added so original HP not conclusive for loose engines.
~ Pete
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