Yep, that should have been the good old mechanical 8.3, a fine and KISS engine.
Was that a typo on the year?
Best of luck to you,
On edit: Just noticed it was your first post! Welcome to IRV2. And keep answering questions, and others might be able to help you more. Might also ask the moderator to move this to the Cummins Section, some pretty sharp people on that section