There is a large color chip of ANA 608 intermediate blue in the back of "The Official Monogram US Navy & Marine Corps Aircraft Color Guide", Vol 2, 1940-1949 by John M. Elliott. He also lists this color as FS 35164, however this looks too dark and blue to my eye, more like the blue-gray used on the earlier naval aircraft color schemes.
The closest match in model paint I've been able to find is Polly Scale US Intem. Blue A/N 608 #505094. It is almost an exact color match to the color chip, except that you might need to lighten it a bit for scale. By the way, this color is very gray looking. It is lighter and grayer than the blue-gray. Do not confuse these two colors, they are totally different.
This is enough to give someone the "blues".
Good luck.
Pete