Nate,
it is almost impossible to give you an answer because it all depends on how "perfect" you want the chrome to be. For example, there is a shop here that specializes in bumper rechroming and is used by many of the top notch restorers around the country. He would charge about $300 for a set of rear bumpers (without guards, no repairs included - and more for the front set) if you want them to look "nice", as the owner says. If you want to win a prize at Pebble Beach or Amelia, and cannot live for example with any surface wave whatsoever, want even "depth", etc. - like new or even better - then he said, it will cost you $900![:0]
You just have to take your pieces to a shop and get an estimate.
Alfred
1966 blue 230SL automatic