I have a 97 f350 460 efi how many o2 sensors should I have?

 

And where are they suppose to be located? I deleted the cat and have a glass pak on it. And don't recall a post o2 sensor and I have no codes suggesting it is or would be missing. I didn't do the exhaust work myself so I don't know what was or wasn't there. Truck seems to be running rich by smell and a little black on the tail pipe. So thought maybe it is missing an o2 sensor or may need to start tracking down some other issue. Or it could be that it is open and I am smelling the exhaust more. And it is stating to burn oil. I just need help font want to mess something up like wash out cylinder walls and but up my rings. Thanks. All and any help is appreciated

 

Should only be 1 on that truck unless it's a california model, pull the codes to see if anything is flagged and if not then you're good to go. Installing an aftermarket cat would go a long way to cleaning up the exhaust smell, they're not nearly as restrictive as the stockers and don't require the factory air tubes so you wouldn't need to reinstall all that crap.