For a $$,$$$ build it makes no sense. GT turbos are a generation back. get the GTX 2863's.
You are certainly at the stage of the game where a haltech or AEM ECU would make sense.
You also should really look into meth or water injection as the pump gas you are running is going to hold you back, and meth or water would really help you push things.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like dressing a Victorias Secret model in a Walmart dress and Payless shoes. You're embarrassing yourself.