OBD1 to OBD2 plus upgrade?

I was going to do the same thing on son’s engine swapped fiero. He sold the car before I did it. I did a lot of research on it. It didn’t look too bad since all of the sensors but one were the same, but that was a GM system. If you have some electrical skills & have a basic understanding of how the engine electrical system works, you can probably do it. I would swap the whole harness. Might be a lot of work for what you get, but if you have time on your hands and like to tinker, go for it.