Daytona Yellow I think finding the elusive yellow is going to be a lot harder than finding the 'correct grey' for these old engines. There was a picture of an 'old yeller' around, seemed a bit deeper than my spray bomb. Since few have ever seen the original yellow it's all going to be a mystery.
I remember seeing Jack Halton's 302 GMC in Army green 20 years ago, great color, great engine. I do think that unless a vehicle is being judged by some impossible standard I'm going to choose a color that is in the spirit of the original and one that pleases me.
Good luck.