I have an original survivor 71' roadster2 that is this color. I just finished cleaning the bike up, although I did not want to restore this bike it did need the tank touched up and sprayed from the seam up over the top, as well as the rear fender. I was worried that the paint would not match due to years of fade. So as I suspected when the correct paint was mixed exactly to formula, (as per blackwidow site), it was way too dark and did not match, so I used part of this mix as a base coat, then lightened it slightly till it matched the original faded paint and used this as a top coat. Then after experimenting with a series of clear gloss and semi gloss mixes shot at different pressures got the desired finish that did not out shine the original paint. All said and done it's not perfect but I think it's close enough. The point is, even if your doing a whole bike, depending on who mixed it, and exactly to formula it may not be exact and you might have to tweek it a little. I hope this made some kind of sense and was a help..
Good luck...