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Rarest '66-'67 Chevelle? How 'bout a '66 L78 with an M-22 and cowl induction? There's a black one like that in one of the glossy Chevelle softcover books. That one plus any Motion conversion car would have to be the rarest of the rare.
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Unfortunately that car you speak of is not REAL/original...Trust me

and it's not Black, it's Danube Blue....Real L-78,... yes, but not M-22...nice car though.
My original MYSTERY CHEVELLE however, was Real and was a 66 L-78, M-22, Cowl Plenum Air Cleaner Car...one of 12.