What years PCM to use?

I've searched through here and seen a lot of cool swaps. Been thinking about this swap for a while for my 71 Dart. I picked a used wire harness and now I'm looking in to getting a PCM and know that they can be reprogrammed to work. MSD sells one but I'm looking to go as cheap as possible. I know PCM's can be picked up fairly cheap but what years are best? I was thinking from 05 - 08? I have a 5.7 in the works now.