Sorry, I assumed used when you said Ebay. my bad. 4ontheFloor is right about the closed loop issue. I assume (there I go again) this is on your 85 w/305 v8? Is it TBI or a feedback carb? If it is the feedback carb those were never real accurate to begin with & you could probably get away with just the 1 side O2 sensor providing feedback. If it's TBI it'll be a little more complicated.
