For stock appearance and electronic ignition, use a stock, vacuum advance, point type dist and add a PerTronix conversion unit plus a hi output coil such as an MSD Blaster 2 or PerTronix Flame Thrower--40,000 volts. It's all TOTALLY contained inside the dist cap and takes up less space than an HEI.
But don't misunderstand me, the HEI is a great dist.
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Tom Parsons