It depends on the condition of your bumper, whether you have any dents or rust pitting. Figure it will cost a little more for a quality rechrome on a good bumper than for a repro.
Freydog, I've pulled bumpers off one car and tried to bolt onto another and found the holes don't always line up with originals, either. Sometimes a washer or two is needed to bring the brackets and holes into alignment, and it's easiest to start all the bolts and have them just loose before tightening them all down.
The repro bumpers are bright, shiny chrome and passable...they are just not factory quality. I stopped in at a Cutlass show last year, and you could spot the repro bumpers from 20 feet on the big, wide Cutlass bumper design. The repro chrome also appeared bluer than the factory chrome.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching