What colour should i paint my 77 GMC high sierra?

[RoughKuntry]

At The Moment Guys I have a 1979 GMC High Sierra Jimmy, She was originally baby blue, with White and Black Interior, But as you can tell from the pictures she isn't anymore, I was thinking about maybe changing her a flat black and maybe old Olive green with the P-40 shark logo on the sides, seems how she isn't square anymore. Her Nose Clip, Fenders, and Hood are from a 87 Suburban, however, I was told you couldn't do that as a custom job, By a GMC Tech up where I live. I think I have proved them wrong.