Help with stock EFI

Not if you’re using an obd2 ecu. If I was doing it and I had to have a 46rh then I would use an obd1 ecu and harness. It will be easier than changing sensors and modifying an obd2 set up to run with the 46rh.
Why do you need to modify the obd2 besides either a stick computer or reflashing the automatic one?