It’s a defective attempt to build a SD70MACH using an unsuitable frame and throwing out most of the 70-series electronics. I don’t think you can cavalierly sling HTCR trucks under a SD40 the way you could by switching toy sideframes.
Maybe he could dig up an old IC SD40A? I wonder if any of those odd beasts are still around? I remember catching one in Springfield, IL back in the early 90’s. Looked ginormous.
Ask the Interwebs a question and it usually has an answer - IC 6014 is still around.