hey guys! on to the next question for my motor build! what spark plugs should use? its c281,tisco pistons, 400 crankshaft,new 450 lp head,new valeves,springs etc,new lp manifold,new petronix ignition, new 450 cam,new cam bearings,and all other bearings obviously,stock stroke, an m carb with a bowl off a 301 combine engine with the big metering stem and a # 27 venturie,and a higher octane gas since ill have quite a bit of compresion.. my question is what should run for spark plugs?? i think whats in my stock M are d16 champions, but idk if those wouldbe what to run! any help would be greatful guys!