BEST Spark plug - 383

902 heads (ported/flowed) 9.5 -1 Comp, MSD6AL /Probillet Dist/Blaster-II coil/MSD wires.

Daily driver, running premium gas.

Currently running Champion RJ12YC..

Any suggestions for a better Spark plug..?

NGK, Autolites, other..?



Thanx.