Not sure on injector change? steveo is way better in LT1 then me so we'll see what he says. If you get or have a set of used injectors always have them serviced before the install. If there's no shop near you look up Mr Injector.

EGR needs to be turned off/disabled in bin as well as removed or it may think it's still working and change fueling and spark.

You can open two instances of TunerPRo when you need parameter values from one mask ID to another. Open TP, load XDF and bin, then Tools, Custom Tools and New Instance of TP. Then you have 2 screens to copy and paste from.