360 Magnum with stock EFI engine codes

I would make sure you got a good battery, to eleminate low voltage. clean all grounds and clear codes and drive it for a couple days and see what comes back. Really sounds like bad connections to me.
I’ll double check connections, but pretty sure battery is good. I’m pretty sure the reason for the codes is the fact none of those things are hooked up. I don’t have O2 sensors, the transmission isn’t connected to the computer harness, I have the sensor that goes in the bottom of the battery tray, but bony know what wires I would connect it to. So that accounts for about 6 of the codes.