Firecaptain, as someone who's been in body shops for a while, I'm not sure painting the 1LE grille would ever come out right. The 1LE front end conversion is a pretty big job compared to what most make it out to be. Don't overthink it but at the same time plenty of research much be done to do it all right. I would probably vote for putting everything on like it came out of the box and see how you like it. It's the true 1LE OEM look but it's not for everyone. If you don't like it, you can go from there.
For anybody looking to order their ZL1 1LE front end conversion, or any OEM GM parts, give us a shot at
GMPartsOutlet.com and see how we price out after shipping compared to others. This is the customer facing parts site of my Chevrolet store which is a sponsor here. PM me if you have questions or feedback.
Good luck!