Since you haven't painted yet, you could get the powder as close as possible to the color you want, then match the paint to the powder.
I prefer lighter color highboys to have a dark frame. The all one color thing is kind of dated to the 80s. On a darker color, it's not as 'in your face'. Thisis personal preference.
Black, dark silvers and grays all look nice.
What is the engine going to be painted?

There are a bunch of pictures on the net to help you visualize. http://www.jalopyjournal.com/forum/showthread.php?t=638541

http://www.jalopyjournal.com/forum/showthread.php?t=654862&highlight=1933+coupe

http://www.jalopyjournal.com/forum/showthread.php?t=415032&highlight=1933+coupe

http://www.jalopyjournal.com/forum/showthread.php?t=422209&highlight=1933+coupe