Paint code for grey primer on the SS Hemi Dart?

Thanks for the replies. I find myself going back and forth between the grey/black scheme vs painting it a more vibrant color. Just as an aside, I looked at some of my previous posts and saw that I originally drove to Vermont, brought the car back to Minnesota in 2016!! Lost the car when my friend/body guy passed away, and his widow sold it to someone else even after knowing the arrangement made where my buddy would finish the car, show it, and then sell it back to me. Anyway after doing some rather lengthy negotiating, the dart is back and will be completed. Thanks again.