Another satisfied customer here....
Used the #40611 EPOXY (3.0 OHM) for my 12V system. Combined with W18 Champion plugs and a Model B distributor cam (from Stipe) on my otherwise stock setup, my cold start-ups are almost instantaneous! Lowered my idle speed also.
Like Purdy says, these coils get hot while running. They are internally resisted so the heat needs to dissipate somewhere. No problem!