The issue with the kit is that the leading edge of the wing is set too close to the centerline of the fuselage. The three major results are that the upper wing fillet is compressed/reduced rather badly, it should be larger in hight and width, especially the forward half. There should be fueling hatches in the fillet as well, and there are plenty of photos to support that. Second, the leading edge of the wing, inboard of the landing gear, should sweep forward and upward compared to the rest of the wing, again, any number of photos show this. Lastly, with the underside of the wing out of position in the kit, the radiator outlet is given a weird kink to connect with the wing. The line of the outlet should be pretty much straight to the wing under surface. The centerline conduit is also a bit questionable. The P-40B drawings here in the website include a view without the wing, and the proper alignment is plainly visible. Photo support is a little harder to find, but is out there for that too.

Don't be too trusting of drawing alone. Even factory drawings don't always represent "as built" configurations. Simularly, be careful as to what photos you look at. Modern reconstructions may have non-original details.