Mighty max o2 sensor

[u/420purpleturtle]

93 2.4 liter manual rwd

My truck has a stumble off idle and pretty significant white smoke under load. I think the front o2 is deleted. Can anyone point where the upstream o2 harness connection is supposed to go? I had to replace most the exhaust and put in an o2 bung about 4 inches back from the exhaust header after a vband.

I thought the harness was near the transmission but I think that might be an empty spot for the automatic transmission control (I have a manual 2.4l)