I bought the E3's to try and see if it made a difference by running an expensive or better quality "so they say" compared to what I was running..the Autolite platinums. It didnt get worse or better so I will never spend the extra money on plugs again! What should I look for in a plug as far as burn in a big block? Would a 750 cfm be enough or would you go 800 cfm? I do also run the silver electronic control box not the orange box, i know there's a difference, I also run the 4 prong ballast resistor not the 2 prong if thats any help? The coil is a aftermarket hotfire coil. Stock waterpump and fuel pump. The distributor is also factory, I have been told many times to get a new one but the price of a 440 distributor is insane and wanna be sure first. Thanks