Another Mopar Off My Bucket List - Barracuda Fastback

My son had taken the Roadrunner into an exhaust shop to have the bung welded into the exhaust before we installed the fuel injection. They (FAST) recommend putting it in the 2 (or 10) o'clock positions. The shop had welded it in at a 4 (or 8 ) o'clock. It may have been low enough to have sustained damage from condensation and soot.

I have another new O2 sensor here. I had purchased it for the Barracuda but never installed it after putting the Purple Hornies on. I always figured I'd upgrade to a quieter exhaust and install it then. I guess if I can't get the Roadrunner to settle down I can swap sensors. If it does turn out to be at fault I'll have to weld another bung in at a higher angle.