Having been involved in judging several NHMC shows, I agree with what Ian (TorchRedSVT) said above. A few pieces are nice, but it's easy to cross the line to tacky. At the other end of the spectrum is Ozz's amazing chrome and polish work.
If you're going to do some chrome, make sure it "matches" -- that is; the chrome pieces work together at highlighting a "theme". It should look like you updated several pieces with a design in mind, and didn't just decide to buy chrome filler caps because they were on sale at Pep Boys.