Swapping the engine to a small block is a ton of work. The trans you have is combined to a transfer case, so if you do a motor upgrade you will need a different trans and transfer case. There used to be a guy on e-bay that was selling rebuilt motors for about a grand but we here have never herd any feed back on him. I would pull your motor and rebuild it yourself. These G180Z motors are simple, with a good manual you could easily be under a grand doing the work yourself. I just finished building one with my wife, they are a piece of cake and if you are doing the labor it is cheap.
And welcome to the site.
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