360 LA installing Promaxx Aluminum heads

I think that plug looks great. So far. Interested to see the fuel ring also. But I’d bet it’s .120 or more up the porcelain. You’re giving away power if it’s that rich (10, 11:1). And on a pump gas street car I like where the timing mark is now. Your willingness to test and tune is refreshing to see. Keep at it.