1987 Dodge Dakota 5.9 swap with a NV3500

I can't say; I haven't done it.
I rebuilt a couple and judging by the size of the components, I think my 367 would blow it up pretty easy.
Back in the day,
340s were rated at 340ftlbs@3200 and
the early 318s were 340@2400
Even NET that would likely be over 300 still.
Butchakno, they only make those number over a narrow range at WOT. Not at idle,lol. So no neutral drops at peak-torque,lol.