As already stated because of the fact that it really cleans up the wiring on the inside of the engine bay. It is a simple one wire hook-up. Also as already stated with the performance upgrades (MSD digital module w/ adjustable RPM limiter, high performance coil) it can handle up to 9,000 RPMs without dropping off. Combine that with the fact that it is a new distributor and HEI uses the spark plug style terminal connections instead of the old loose slip-in socket type that the Mopars had.
For only $270.00 (shipped) it seemed to be the best package that I could put together for my ignition system budget of $400.00.
Did I mention the supersized bright red HEI distributor cap looks awesome on the from of a Mopar big block?
If I bought a new Mopar distributor, I'd still have to get the Mopar Performance ECU, a performance coil, some type of RPM limiter, and an aftermarket cap with the spark plug style terminals...