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I found the exact color for the 70 and up GM jack bases and jack mechanisms: judge for yourself:
It's Duplicolor DE 1609 Chevrolet Blue Engine Enamel
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Hmmmmmm, maybe you've also solved the mystery of why Chevy all of a sudden in the mid-70's switched from orange to blue on engine paints....
(....dropping in on a conversation in GM purchasing dept in mid-70's....) "I told you to order 500 gallons of blue paint for jack bases and you ordered 500,000 gallons! Now what are we gonna do with all that extra paint?"