Hi,

I think I found now what color Hal DeBolt Interceptor Mk 1 had. Blue and white. I believe it is shown in Charles Winter updated DVD of Golden era pattern flying (2:10 - 3:00 in the video) - "Detroit Invitationals" 1963, -64, -65. Something like dark blue and white it seems to be in the video.
I'm not 100% sure it is Interceptor Mk 1 shown in the video but it is very similar. The white paint on the fuselage seems perhaps little broader in the video compared to the construction article that is why I hesitate.
Image below from a snapshoot from the video (could not grab any better quality then this).

/Bo