Maverick 86 Convertable

I have a unique or not so unique problem, I have an 86 convertable that was a V6 car that I converted to a V8, the V8 is out of an 89 or 90 hatchback. I need to know what wires from the engine harness need to be spliced into the body harness to make the whole thing work due to the change in the plugs from the 86 & later (square plugs) to the round 87 & up (round plugs). Can someone who's done this before give me a breakdown list & or a wiring diagram that will help me avoid pulling my hair out. Or if someone has the 1 of a kind factory harness for this car I am willing to travel a distance of up to 300 miles to pick it up. I am on a VERY tight budget as I dont have much money to spend on the part if it was for sale. Please HELP!!!

Maverick 86 Convertable