Not a concours method but here's what I did for both the back AND the front.
Rear: The grills come apart from the housings with about 8 or so 3/8" nuts. I believe that's the right size. Clean up the lenses. Then I used fine steel wool to clean the black paint off the grills and it also cleaned up the chrome at the same time. Then I used very thin pinstriping tape to mask off the chrome teeth and sprayed it with etching trim paint so it bites into the metal. Peel off the tape to reveal the chrome.
I did the same on the front except I removed the headlight bulbs and buckets inside and did all those pieces separately. I used the same method of cleaning and masking only using slightly wider pinstriping tape. (That stuff comes in a whole bunch of widths.) It's even more important to use the etching paint on the front due to debris always trying to sandblast the stuff while you drive.
Bear in mind, this method is NOT for the restorer types and as a result, you'll only leave the fronts of the chrome teeth, chrome; rather than the sides of the teeth as well. I came up with this idea when I was toying with the idea of blacking out the entire thing, but was afraid that I wouldn't be able to go back if I didn't like it. If you do like it, you can just leave the tape on and it will stay black, provided you use black tape. People have asked me how did I get just the fronts of the teeth to be chrome???
Have Fun with this one!! It's very time consuming but worth it in the long run.
Mark