OK, about those black cowls. Let's do a bit of a summary of what's out there.
First off, George Bostiwick's rig evidently has a black band around the cowl as can be seen in this colour pic, same one as I put up in post 3.
It is clear in some photos that not all 63rd FS Jugs had these bands and yet some others, unfortunately in black and white appear to suggest that some aircraft other than Bostwick's had it. BTW, some of what I'm offering up here is discussed here:
P47 Heaven :: P-47M Colours 63FS/56FG
Let's take a look at Chuck McBath's Dottie Dee II, same one as Karl posted in #89. Here's a pic of the nose:
To me, there's a distinct difference in the cowl colour and the fuselage behind it, the colour purported to be dark blue. However, there's an even darker colour around the nose art that stands out against the cowl. So, is the cowl black or not? Some say no while others suggest he cowl is flat black and the border around the nose art is gloss black. I'm leaning toward the latter theory.
Now, let's take a look at Fireball. Here's Kuhn standing in front of his aircraft. At first glance the picture does not appear to offer as much of a clue as the one above but take a look at the shades to the left of Kuhn's head. There appears to be a definite difference between the cowl and the cowl flaps and the fuselage looks the same as the cowl flaps. I thought at first that the light might be hitting the cowl flaps differently if they were open but they are in fact closed, so the surfaces in this area would be at the same angle. Also, take a look at this same pic, albeit darker and more pixelated, that Bill put up in Post 17. Did Fireball have a Black cowl?
Here's another interesting shot in which Fireball can be seen behind "Ole Miss Lib". This is the same pic I made a detail of a few posts back.
On the plane in the foreground, if you ignore the weathered panels and look along the top quarter of the fuselage, there appear to be no differences in colour, suggesting that the cowl was the same colour as the fuselage. Now do the same on Fireball in the background and notice how much darker the cowl is than the area behind it. It's also a lot darker than the cowl on "Ole Miss Lib". Here's a close-up detail to show what I mean:
Personally, I'm leaning toward Fireball having a black cowl. What do you guys think?