Fix the broken wire for starters.
Check EVERYWHERE and make sure no other wires are pinched or broken. Also make sure everything is plugged in, Reseat all of the connectors if you have to. Ensure the engine is grounded to the frame, not the cradle. After all of that, clear all codes and see if they come back.
1986 SE Aero coupe.
3.4 DOHC swap is complete and running, now just have to finish the rest of the car...