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I think if the only thing changed is the engine (keeping the 4 spd behind the 617), your MPG would not be what it was with the 4 cyl. I am not familiar with the OM617 numbers, but if it is a turbo, you would need to change the rear end ratio (higher=lower numerically) to get anything close to 30 MPG. (EDIT: just re-read that the donor is an '85, so it is turbo)
If you are close to CA, I could use a 240 bottom end!
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