I've seen both colors in originals of almost every year of AD trucks. Brother in law has a 54 with a gray engine, all original. My 52 had a blue 216, original. Drove a 52 with a 216 in high school with a gray engine. Have seen 54 & 55-1's with blue engines. Notice a pattern? I don't! Pick the color you want. If you want blue, Plasticote makes a Chevy blue engine enamel that is the closest I have found. Can't help on the gray, though.


Fred
52 3600
69 C-10