Which was not a GTO.... (Datsun based replica, and a horrible one at that).
This, however, is a black GTO: Brandon Wang's car, 4219GT. Gorgeous. Photocredits unknown.
As for your Daytona, Boxer, a dark classic colour would be great (I would only use the original Ferrari palette of 1968-1972). My personal short-list would be:
1. Rosso Cordoba 106-R-136. Very, very, very dark bordeaux red. Stunning.
2. Blu Sera Metallizzato 106-A-018.
3. Nero 20-B-50
4. Blu Scuro 20-A-357
5. Prugna Metallizzato 20-R-549.
I think Rosso Cordoba, as it looks on this 275GTB, would be a clear winner for me.
See this page for a colour chart with pics.
http://www.dinorestoration.com/resources/dinocolors/
And this one:
http://www.jb330gt.com/Colors.htm
Onno