Ron,
Black all the way! Your car has the most kick a@@ historic blue colour that I have seen on a replica and I (as most others) just melt when I see photos of it, squashing weeds with the blacked out 15s and all of your beautiful and well researched period-piece body touches. Go 17's if you have to (for the track?), but paint them out in black.
Blacked out rims just look so '50's, when they used to paint their spoked wheels black. They just add so much to the historic look! My 2c.
I ran a late model 17" on my cobra and polished the outer inch late in the piece. I will undoubtedly receive significant grief over not using original style spinners on the cob, and for that reason, there is no way I am gonna 'fess up and tell you all what I used for the motor and `box.....;-)
Black, Buddy, all the way!
Gaz.