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Unless you are drag racing and need 2-3 step rev control, and/or running N2O/Boost and need spark retard, there is no advantage to MSD over HEI IMHO.
If fact HEI is often adapted for use on other engines. It's simpler, easier to install and often cheaper.
If are planning on drag racing, I would run the digtal mallery 6A, it has boost retard and a 2 step built in for about 40 bucks more than an analog MSD. I run one on my car and never had a problem. I can also change rev limits with buttons, and not have to but pills like the old analog MSDs. Just my .02
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