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All M939A2 series should have the 8.3L, if you have a M929 with supersingles and a NHC-250 Cummins, it's either a A0 or A1.
IMO the newerer the motor the easier it will to have serviced. I doubt most techs in a diesel shop remember a NHC-250 let alone being as old as one. It's antiquated...