360 LA installing Promaxx Aluminum heads

Just checking. According to the plug your lean. Re-calibrate the 02’s. Perhaps, IDK for sure, but the placement of the 02’s might be a little far away from ideal. I use headers and there placed right in the collector, not the reducer. I also install the full exhaust system that I’ll use since it plays a big role in how the carb see’s the signal and operates.