I need to know how hard on a scale of 1 to 10 changing the opti-spark is on a 96 Z28? I consider myself and my brothers (work crew) fairly good at working on cars (multiple boltons including headers, suspension, exhaust etc...) I am convinced it is not that hard, but just time consuming. My little brother wants to take it to a shop to have them swap it for 150.00 So, how tough?

 

It's no harder than a water pump and does not take that long. One online guide here.