I purchased a set of CA personalized plates (RPO ZK7) about 10 years ago (back when the "CALIFORNIA" was imprinted on the plate and not stenciled.) The plates came from DMV with blue letters on a white background.
I sent the plates to Darryl's in PA and had them paint the plates black and yellow the way the would have been painted back in 1968. Darryl's did an abolutely perfect job. (Check under "Services Offered" in Hemmings for info on Darryl's. They're listed every month.) The cost was $60, which was well worth it because I don't have the patience for that type of work.
After I put the plates on the car, I was promptly pulled over by a CHP. He noticed the plates wanted to know where I had the them restored. He had similar plans for a 65 Mustang he was restoring. In a total of 10 years, I had about a half dozen cops comment on the plates. All of them said that it was technically illegal, but none of them cared.
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Robert
www.classiccarlot.com (15% discount for my fellow Chevelle owners!)