I just completed this upgrade on my 89 Ramcharger. This was necessary because I swapped out the tired 318 (original factory rated hp was only 150, pathetic) with a rebuilt 95 Magnum 360 with EQ heads and Fitech EFI. In that era of Dodge trucks the rudimentary engine computer controlled timing (dist. has no mechanical advance), voltage regulator, and the factory fuel injection. This computer does not work well with performance upgrades and needed to be bypassed.
Anyway, this HEI system is pretty slick and can easily be used on our E-body cars with a minimum of work. It is not easy to see once installed, gets rid of the ballast resistor, and puts out a better spark, especially with a coil upgrade, because the coil gets a full 12 volts all the time, not just at start up. Also, your tach will still work with just running the tach wire to the negative side of the coil. If you don’t like the ballast system, or have a weak spark, this is worth consideration.
I am not affiliated with this company or product, I’m just a satisfied customer.