5.9 magnum?

I would recommend at least looking at the crank.
My 5.9 still had the cross hatches in the cylinders, but the crank was wore, like it was run low on oil once.
I tore it clear down and cut the crank .010 and reconditioned the rods.
I still run the stock bore in it.
You can take the oil pump apart and check clearances, I bet you find it is good to use.