rich fuel odor

I need the pin out I have a bank one running lean but it’s dumping gas stft is at 40 percent replaced all o2sensors it’s a brand new motor from Frasier engine now I’m think there’s a short or bad ecm

As the title states, I have this horrendous exhaust odor that seems to be coming from under the hood. I suspect the intake gasket has failed, but I want other opinions. The truck is a 92, 12/91 build date, 223k miles, to my knowledge original everything, with the exception of what I have...