I would suggest to stay with the good ole NOS brand. My brother had a ZEX kit and he had problems and I have heard mixed things about ZEX from other people as well.

It is safer to run additional fuel when running a 125 shot or larger to keep from detonating. Below 125 and it is overkill. Your fuel system is more than adequate. You just need to install a adjustable fuel pressure regulator and find some way to back out some engine timing.

You will also need colder plugs. I never ran a purge valve because they tend to leak and they also let everyone know that you are running juice.

Hope that helps.