Way back in the dark ages I ran the accell super coil on a 440 street car with a stock dist/HEI module with no ballast & it ran flawless & started almost instantaneously in the summer time with the right amt of pumps on the thermoquad. Later per my inquiry Accell sent me a letter saying to run a .7 or .8 ohm ballast with it (I forget which, was 35 yrs ago).