I have a 1954 Chevy 235 motor I’ve decided to rebuild and want to paint it when I get it back. I’ve seen two different gray colors used, one dark and one light. Which color is correct?

Thanks
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Chuck
1950 Chevy 1/2 ton (all original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod