On an HEI I would guess you're not having coil problems but something else. First, check all the simple crap. Make sure all your wires are hooked up and in good condition, next make sure you have the ground strap in the cap with the coil. Also check the rubber grommet and button & spring under the coil in the top of the cap. If all this fails check the module, could be going bad or alraedy dead and the new coil, just gives it enough to fire for a second. Most parts stores will check the module for you. I rarely see HEI coils burn up, it's almost always another source and I wouldn't be surprised if you coils still work.