I think that the hei looks right at home under the hood. Cleans up the engine compartment with the intergrated coil and the lack of a coil wire.
I have an hei in my 9, but I don't have anything to compare it with because when I installed the reman 400, I installed the hei.
Spark only does so much. Yes, a hotter/more intense spark is better than less, and it offeres more power, but there is a point where more intensity of the spark has no value. For a basically stock configuration, the hei delivers as much usable spark as the engine can use.
The spark is stable, whereas the spark from the points isn't as consistant. Hot crank issue notwithstanding, my engines have always fired instantly without cranking. Even so, the hei helps ensure instant starts. Best of all, there isn't anything to dink with. Everytime you remove the points screws, even if you use a spring loades screw holser, do you wonder "will this time be the time I drop the screw and loose it?"