Repost: d15b6 with mpfi swap

This is a repost from the electrical section, apologies if this is improper etiquette .

I recently came into possession of a project 1991 dx wagon that has been "swapped" with a d15b6 with mpfi. I am confused as to the wiring that needs to be done. I have both the harness for the new engine and the harness from the original engine and was wondering what be best course of action would be. Which harness should I install and then begin splicing wires into? Additionally, are there any resources here or elsewhere that might allow me do some additional research? Thank you.

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