Holley/Demon Carb stumble

I spent 2 year trying to get this !@#%$#^^$ o2 sensor to work. In the end the muffler shop welled the bung off set and i was crushing the o2 sensor and it would last 1 or two eng starts. Blamed it on the leaded racing fuel! When threw a dozen of them $$$ o2 before i figured it out.
Same sensor for about a year now.

So i'm a little bit gun shy about testing fate right now. Beside high gear pull is all i'm trying to do right now. Idle and tip in is grate with this Proform carb.