I would also be more inclined to say the 351 C is a Cleveland block with Boss 302 heads by your logic, since the Boss 302 debuted before the 351C, but since the heads are not the same, it doesn't matter.
Also, you better check your specs sheets again. The Boss 351 also came with different rods, pistons, camshaft, distributor, and intake manifold from the standard 351C 4V.
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