Quick question about what spark plugs to run with Edelbrock Etec 170 heads on a Vortec 383 OEM ignition system. The heads call for a 14mm 3/4" reach 5/8" hex washer plug. I know the factory plug specs on the Vortec are a .060 gap with a heat range of 5, so I have been trying to find a equivlent plug that will fit these heads. Right now, I have NGK plugs, cant remember what # but they had a factory gap of .040, and I gapped them to .045 before the wire started to bend away from the electrode. I mean they are working but... Thanks for any input.