Stock magnum efi under hood fit?

well,like an idiot, i didn't keep the obd port,although i think i can rewire it back in, and the engine only had one upstream o2 sensor. been told i need to run an x or h pipe for the o2 so it can read both banks, and probably have the computer reflashed to get rid of the auto tranny and purge solenoid.it's been running fine for the last three years, but it would probably get a little better mileage without all the stored codes. dave.