These are just the issues you are aware of. I am certain that most of the other components including the pump are in need of a replacement or rebuild. My guess is this engine has between 200-300K miles, not the 50-60K that the importer claims. This is pretty typical from my experience that these engines are not worth the money, but it is good that they are working with you.

Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,

1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored

2003 G500, sliders, beadlocks, roofrack, ladder etc.