Problem I have with New Ford Grey is it is too light and too grey. ( Maybe it's too FORD?).
We did the 283 in my '58 'NFG and it looks bitchen, but it's not right. That motor was completely original when I tore it down but I didn't think to try and match the paint.
Just depends on what you want. Nobody would probably ever come up and say that your 283 is the wrong shade, more likely they'd ask "Why isn't it Orange??"