I can't be sure about this, as I never dug into it further than theory, but when I was searching around for a short block, even though the blocks for the Diamante, Kia Sedona, etc.. were essentially the same: All the engines I found in the junkyards were not identical to the Montero. Some of the motor mount bosses, and the bolt holes were in different spots, and AC bolt holes were not drilled in the block.

Hang in there Lloyd, I know what you're going through, and it isn't easy. You'll get it fixed up.