Improvement switching to MSD or similar igniton?

One thing that you will notice especially if you have a cam of some kind in there is an improved idle quality. Look at the Mallory stuff. It costs less than the MSD and its all digital instead of analog. I have the Mallory 685 and I love it. It has a adjustable start retard a switchable retard that I use when I'm spraying, 2 rev limiters, and I know there's more that i can't remember now. Give it a look.