[JL8Jeff]

I would suggest getting new O2 sensors. If the old ones need to be hit hard to remove them because they are rusted in place or stuck, it will be a short matter of time before they go bad. But, if you're putting in new headers, you are better off using the old O2's to run the engine and burn off any coating that might contaminate the O2's. I forget which O2's I ran but they had longer wires with the correct plug so it helps eliminate the need for O2 extensions. I can't remember if I went from the top or bottom to install the passenger header. I had emission's headers so they have some extra clearance issues getting them in. They were still easier than installing the LT1 emission's headers.