'Drives like a tank' hm? Okay, I understand now-and if the car is that heavy and unwieldy then the engine should power a truck just fine.
Christ is right though-this is untested and (possibly) unreliable until you get the kinks out. If you need a reliable truck while you're experimenting with a Diesel conversion, I suggest keeping your gas truck in one piece and try to find a decent 'blown-motor' Glider on Craigslist or locally. If you have problems/delays later on, it won't be a crisis because you still have the truck, and you can put it back up on blocks for Ecomods of your choosing later on without a ticking clock in the background...
Later, when the Diesel conversion is perfect, you can find the Gasser a good home somewhere-or better yet, it becomes the 'spare' and a candidate for another Diesel or EV conversion!
Did I mention how much I envy you this project? Even if I had the money, the workshop, the tools and the skill (and I have none of the above) I am still not allowed to make a Diesel swap in NC...it won't pass inspection!
Yet I am allowed to make Kit Cars by NC Law oddly enough-go figure.