Questions about a 2006 5.7

The Eagle heads have the provision for EGR, even though it wasn't used. If not using the EGR, just plug the intake. If needing the EGR on the Eagle, I suppose you could drill the passage. It's right there.
no EGR on a later model, interesting. Dealing with valve seat issues, so I have to change the intake, mainly since 3 other cylinders have piston damage there is most likely more in the intake. Guess I need to research more. I am in Illinois so they wont test a vehicle if the check engine light is on so if it will throw a code I will need to figure something else out. The later plenums are at a 90 degree angle.
Thank you for your help.