NGK recommends the following plugs for Edelbrock heads.
R5672A-7 is a non resistor race plug. -7 is the hottest plug they offer. -11 is the coldest one. This is a projected tip spark plug. Use R5671 for domed pistons.
BCPR6ES is a resistor type street plug.(Stock #6779) This is what I currently use on my 383 Road Runner with MSD ignition. These are available in heat ranges 4 thru 9

1969 Plymouth Road Runner 440 auto
2017 Ram 1500 Quad Cab 5.7 Hemi