I don't know what Isuzu engine that is, but it's not a 4BD1. Wrong IP type, fuel filter location, alt. location, no gear driven power steering pump, single oil filter, etc, etc..
May be good engine, but not a standard Isuzu 4BD1/2.
I have a 4bd2t complete core here out of a 95 npr. It was barely running on 2 cylinders when I pulled it out and was knocking and pushing coolant, core core core, I will include the 5 speed transmission and the clutch/flywheel for $800 on Vancouver Island.