As a "qualified" answer, most blocks were originally sprayed with the "thinnest" of gunmetal black paint - as a minimal rust deterrent. If it was "glossy," the gloss was short lived. As one might expect, showroom display models may have received different treatment and dealers may have added their own special artistic contribution. At least one dealer clear coated engines as part of a "detailing" package, much like additional profit enhancing rust protection. Things looked great (including the overspray on wiring and the valve cover) until the clear took on a yellow hue. Examine period literature/photos and, for perhaps obvious reasons, the aluminum bits take center stage and the block is a supporting player.
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