I have a '79 Newell. The previous owner replaced the Cummins 555 on it with a Cummins 903 with a turbocharger. Mine has several thousand miles on it and it has run very well. I don't think there were any major modifications to make it fit or work - at least the repair records didn't indicate anything significant. I don't know how hard it would be to find a used or rebuilt one or what it would cost, however.
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