They don't do REAL cad plating anymore from what I've learned. Toxic crap, etc., etc. But generally, up through 84, they plated them. 85 and up they painted them black.
When that cad paint from Eastwood first came out, I tried it on my 71 442 and wish I didn't. PITA and also didn't do a great job. Doesn't look nasty, but not even close to correct.
The other option, if you don't want black, is simply paint it a soft gold color. It won't be all funky colored like original, but it'll present well if absolute originality is NOT the goal.
Of course, if you like spending money...
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