Bill , I also have a CA El Camino , and when I purchased it , almost 20 years ago , mine is a black plate car too. That is my understanding, that the black plates stay with the car, would love to know what they do mean.
Good luck
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Lately into Beaumont SD's, 66,67,68 and 69 , including a 69 2 Dr Post Beaumont , an L78 2 Dr Post Chevelle LS6 Chevelle's, LS6 and L78 El Camino and Camaro fan ! Also 2 Cdn Documented COPO's, a COPO Camaro and COPO Chevelle Love GM Products
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