Testors Mustang Help

Hi all. I had recently acquired an old, 1970, Testors P-51 plane. The only thing missing was the glow plug, otherwise complete and a cracked canopy. It would appear to me that the plane was originally molded in yellow. Someone back when had decided to paint it dark metallic grey on top and dark metallic blue on the underside, with what appears to be something like Testors model paint. Anyways, I have no attachment to this thing whatsoever, but would like to try and get it back to original anyways. Also, the good thing is that it does not appear to be roughed up prior to painting. It does lightly flake off if scraped with a small screwdriver. so if anyone here has any ideas as to what to do, I would be willing to try.