Are there any valuable ignition upgrades

These options are endless. It all depends on what you are looking for. If you are looking for performance then MSD ignition systems are the way to go in my opinion. Once you go there, you can get everything for the ignition system from distributor to plugs.

If you are looking for reliability then you just want to stay away from things titled for racing applications. However, I would still go with MSD.

What I would suggest is to jump on Summit racing's website and start shopping.

Clearly you don't need to go to this extent but this will give you the best balance between performance and cost. There is nothing wrong with going with OEM replacements but this will not be considered an upgrade.

Hopefully this answers your question. Let me know if you have more and we can go from there.