I recommend the Pertronix E-core coil 60103 for use with an HEI setup for a couple of reasons. First, it has very low .32 ohm primary resistance and the HEI module has no problems dealing with it - without any ballast. That means that you can get more power to your plugs. Second, it has screw-on lugs that make it easy to connect other electrical accessories to the switched power.
http://www.summitracing.com/parts/pnx-60103/overview/
