So Im looking at replacing my plugs. I have a mildly built 340, Edelbrock AVS2 650, LD340 intake, MSD 6AL2 ignition/distributor, Edelbrock heads, unsure of cam but am told its a mild roller, TTI long tube headers, 4spd. Currently the plugs in it are NGK 7496 BCP5ES gapped at .040, which have...