obd2 magnum swap?

If it helps, you can download the Hotwire auto wiring diagram as a guide. One of the tricks is to use an ECM for a 5 speed vehicle without security.

As for the power steering hitting the battery/tray, I simply modified the tray and used a narrower battery.

Once you get it finished, you will know how wonderful it is to have EFI in these old cars. I think about that every time I twist the key.