Sucks to hear about the engine.
Since some of our other "senior" members are in Moab right now, I will cover the general response you would get

Use the search feature at the top of the screen. Just about every question you will have has been covered in great detail at some point, if you can't ind what you are looking for, feel free to ask.
We have quite a knowledge base to share, but it gets frustrating hearing the same question over and over again.

Welcome to the family, sounds like you have some research to do, there are some great threads to read with info about the VX that should be perused prior to purchase, covering what parts can be found, what our common issues are, where to find parts and the concept that to own a VX requires deep pockets, or the ability to do your own work, or a lot of down time for the truck while saving money to fix random broken stuff.

Actuators are available in new stock, try isuzuparts.com. The motor is the same in the trooper, and I would guess the rodeo. Try hitting the junkyards.

As for the engine, I would find a rebuilt engine from a reputable dealer or even better, go to the 3.2L. There are threads on here about the swap.

Good luck, and once again, welcome to the obsession!